bolt (v.) Look up bolt at Dictionary.com
from bolt (n.) in its various senses; from a crossbow arrow's quick flight comes the meaning "to spring, to make a quick start" (early 13c.). Via the notion of runaway horses, this came to mean "to leave suddenly" (early 19c.). Meaning "to gulp down food" is from 1794. The meaning "to secure by means of a bolt" is from 1580s. Related: Bolted; bolting.
bomb (v.) Look up bomb at Dictionary.com
1680s, from bomb (n.). Meaning "to fail" attested from 1963. Related: Bombed; bombing. Slang bombed "drunk" is attested by 1956.
bomb (n.) Look up bomb at Dictionary.com
1580s, from French bombe, from Italian bomba, probably from Latin bombus "a deep, hollow noise; a buzzing or booming sound," from Greek bombos "deep and hollow sound," echoic. Originally of mortar shells, etc.; modern sense of "explosive device placed by hand or dropped from airplane" is 1909. Meaning "old car" is from 1953. Meaning "success" is from 1954 (late 1990s slang the bomb "the best" is probably a fresh formation); opposite sense of "a failure" is from 1963. The bomb "atomic bomb" is from 1945.
bombard (v.) Look up bombard at Dictionary.com
1590s, from French bombarder, from bombarde "mortar, catapult" (see bombard (n.)). Figurative sense by 1765. Related: Bombarded; bombarding.
bombard (n.) Look up bombard at Dictionary.com
early 15c., "catapult, military engine for throwing large stones," from Middle French bombarde "mortar, catapult" (14c.), from bombe (see bomb (n.)). The same word, from the same source, was used in English and French late 14c. in reference to the bass shawm, a bassoon-like musical instrument, preserving the "buzzing" sense in the Latin.
bombardier (n.) Look up bombardier at Dictionary.com
1550s, soldier with a bombard, from French bombardier, from bombard (see bombard (n.)). In 17c.-18c. of soldiers who manned artillery (especially mortars and howitzers); meaning "one who aims the bombs in an aircraft" is attested 1932, American English.
bombast (n.) Look up bombast at Dictionary.com
1560s, "cotton padding," corrupted from earlier bombace (1550s), from Old French bombace "cotton, cotton wadding," from Late Latin bombacem, accusative of bombax "cotton, 'linteorum aut aliae quaevis quisquiliae,' " a corruption and transferred use of Latin bombyx "silk," from Greek bombyx "silk, silkworm" (which also came to mean "cotton" in Medieval Greek), from some oriental word, perhaps related to Iranian pambak (modern panba) or Armenian bambok, perhaps ultimately from a PIE root meaning "to twist, wind." From stuffing and padding for clothes or upholstery, meaning extended to "pompous, empty speech" (1580s).

Also from the same source are Swedish bomull, Danish bomuld "cotton," and, via Turkish forms, Modern Greek mpampaki, Rumanian bumbac, Serbo-Croatian pamuk. German baumwolle "cotton" is probably from the Latin word but altered by folk-etymology to look like "tree wool." Polish bawełna, Lithuanian bovelna are partial translations from German.
bombastic (adj.) Look up bombastic at Dictionary.com
1704, "inflated," from bombast + -ic. Meaning "given to bombastic language" is from 1727.
Bombay Look up Bombay at Dictionary.com
city in western India, from Portuguese, and popularly explained as Portuguese bom bahia "good bay," but that seems folk etymology (for one, the adjective is masculine and the noun is feminine), and the more likely candidate is the local Mumbadevi "Goddess Mumba," a Hindu deity worshipped there. The city's name officially changed to Mumbai in 1995.
bombazine (n.) Look up bombazine at Dictionary.com
(also bombasine, bambazine), 1550s, from French bombasin (14c.) "cotton cloth," from Medieval Latin bombacinium "silk texture," from Late Latin bombycinium, neuter of bombycinius "silken," from bombyx "silk, silkworm," from Greek bombyx. The post-classical transfer of the word from "silk" to "cotton" may reflect the perceived "silk-like" nature of the fabric, or a waning of familiarity with genuine silk in the European Dark Ages, but compare bombast.
bomber (n.) Look up bomber at Dictionary.com
"one who throws bombs," 1915, agent noun from bomb (v.). As a type of military aircraft, from 1917.
bombinate (v.) Look up bombinate at Dictionary.com
"make a buzzing noise," 1865, from Latin bombinare, corrupted from bombitare "to hum, buzz," from bombus "a deep, hollow sound; hum, buzz," echoic. Related: Bombinated; bombinating.
bombination (n.) Look up bombination at Dictionary.com
1816; see bombinate + -ion.
bombshell (n.) Look up bombshell at Dictionary.com
1708, from bomb (n.) + shell (n.). The figurative sense of "shattering or devastating thing or event" attested from 1860. In reference to a pretty woman (especially a blonde) it is attested from 1942 ("Bombshell" as title of a movie starring blond U.S. actress Jean Harlow (1911-1937) is from 1933).
bon (adj.) Look up bon at Dictionary.com
French, literally "good" (adj.), from Latin bonus "good" (see bene-). It has crossed the Channel in phrases such as bon apétit (1860), literally "good appetite;" bon-ton (1744) "good style;" bon mot.
bon mot (n.) Look up bon mot at Dictionary.com
1735, French, "good saying, " literally "good word," from bon "good" + mot (12c.), from Vulgar Latin muttum, from Latin muttire "to mutter, mumble, murmur" (see mutter).
bon vivant (n.) Look up bon vivant at Dictionary.com
also bon-vivant, "one fond of good living," 1690s, French (see bon); the fem. is bonne vivante.
bon voyage Look up bon voyage at Dictionary.com
1670s, French, "pleasant journey," from bon "good," (see bon) + voyage (see voyage (n.)).
bona fide Look up bona fide at Dictionary.com
1540s, Latin, literally "in good faith," ablative of bona fides "good faith" (see faith). Originally used as an adverb, later (18c.) also as an adjective. The opposite is mala fide.
bona fides (n.) Look up bona fides at Dictionary.com
by 1838, English pluralization of bona fide, as though it were a noun meaning "guarantee of good faith."
bonafide Look up bonafide at Dictionary.com
see bona fide.
bonanza (n.) Look up bonanza at Dictionary.com
1844, American English, from Spanish bonanza "a rich lode," originally "fair weather at sea, prosperity," from Vulgar Latin *bonacia, from Latin bonus "good" (see bene-).
bonbon (n.) Look up bonbon at Dictionary.com
1796, from French bonbon (17c.), childish reduplication of bon "good." Hence, bonbonniere (1818) "a box for sweets."
bond (n.) Look up bond at Dictionary.com
early 13c., "anything that binds," phonetic variant of band (n.1). For vowel change, see long (adj.); also influenced by Old English bonda "householder," literally "dweller" (see bondage). Legalistic sense first recorded 1590s.
bond (v.) Look up bond at Dictionary.com
1670s (transitive), from bond (n.). Intransitive sense from 1836. Originally of things; of persons by 1969. Related: Bonded; bonding. Male bonding attested by 1969.
bondage (n.) Look up bondage at Dictionary.com
c. 1300, "condition of a serf or slave," from Anglo-Latin bondagium, from Middle English bond "a serf, tenant farmer," from Old English bonda "householder," from Old Norse boandi "free-born farmer," noun use of present participle of boa "dwell, prepare, inhabit," from PIE *bhow-, from root *bheue- "to be, exist, dwell" (see be). Meaning in English changed by influence of bond. The sexual sado-masochism sense is recorded by 1966.
bonded (adj.) Look up bonded at Dictionary.com
"legally confirmed by bond," 1590s, from bond (v.).
bondman (n.) Look up bondman at Dictionary.com
mid-13c., "husband, husbandman," from Middle English bond (see bondage) + man (n.). Later, "man in bondage, slave" (mid-14c.).
bondsman (n.) Look up bondsman at Dictionary.com
"one who stands surety by bond," 1754, from bond (n.) + man (n.), with genitive -s- added probably in part to avoid confusion with bondman.
bone (n.) Look up bone at Dictionary.com
Old English ban "bone, tusk," from Proto-Germanic *bainam (source also of Old Frisian ben, Old Norse bein, Danish ben, German Bein). No cognates outside Germanic (the common PIE root is *os-; see osseous); the Norse, Dutch, and German cognates also mean "shank of the leg," and this is the main meaning in Modern German, but English never seems to have had this sense.
bone (v.) Look up bone at Dictionary.com
especially in bone up "study," 1880s student slang, probably from "Bohn's Classical Library," a popular series in higher education published by German-born English publisher Henry George Bohn (1796-1884) as part of a broad series of "libraries" he issued from 1846, totaling 766 volumes, continued after 1864 by G. Bell & Sons.
bonehead (n.) Look up bonehead at Dictionary.com
"stupid person," 1908, from bone (n.) + head (n.). Compare blockhead, meathead.
boner (n.) Look up boner at Dictionary.com
"blunder," 1912, baseball slang, probably from bonehead. Meaning "erect penis" is 1950s, from earlier bone-on (1940s), probably a variation (with connecting notion of "hardness") of hard-on (1893).
bones (n.) Look up bones at Dictionary.com
plural of bone (n.). As a colloquial way to say "dice," it is attested from late 14c. As a nickname for a surgeon, it dates to 1887, short for sawbones. To make bones about something (mid-15c.) refers to bones found in soup, etc., as an obstacle to being swallowed. To feel something in one's bones "have a presentiment" is 1867, American English.
bonfire (n.) Look up bonfire at Dictionary.com
1550s, from Middle English banefire (late 15c.), originally a fire in which bones were burned. See bone (n.) + fire (n.).
bong (n.) Look up bong at Dictionary.com
"water pipe for marijuana," 1960s, U.S. slang, said to have been introduced by Vietnam War veterans, said to be from Thai baung, literally "cylindrical wooden tube."
bongo (n.) Look up bongo at Dictionary.com
1920, from American Spanish (West Indies, especially Cuba), from a word of West African origin, such as Lokele (Zaire) boungu.
bonhomie (n.) Look up bonhomie at Dictionary.com
"good nature," 1803, from French bonhomie "good nature, easy temper," from bonhomme "good man" (with unusual loss of -m-), from bon "good" (see bon) + homme "man," from Latin homo (see homunculus).
Boniface Look up Boniface at Dictionary.com
"innkeeper," from Will Boniface, character in George Farquhar's comedy "The Beaux' Stratagem" (1707).
Contrary to the common opinion, this name derives not from Latin bonifacius 'well-doer,' but from bonifatius, from bonum 'good' and fatum 'fate.' The change to Bonifacius was due to pronunciation and from this was deduced a false etymology. Bonifatius is frequent on Latin inscriptions. Bonifacius is found only twice and these late (Thesaurus) ["Dictionary of English Surnames"]
bonito (n.) Look up bonito at Dictionary.com
type of sea fish, 1590s, from Spanish bonito, probably literally "the good one," diminutive of bueno "good," from Latin bonus (see bene-).
bonjour Look up bonjour at Dictionary.com
French, literally "good day," from bon "good," from Latin bonus (see bene-) + jour (see journey (n.)).
bonk (v.) Look up bonk at Dictionary.com
"to hit," 1931, probably of imitative origin; 1975 in sense of "have sexual intercourse with." Related: Bonked; bonking.
bonkers (adj.) Look up bonkers at Dictionary.com
"crazy," 1957, British slang, perhaps from earlier naval slang meaning "slightly drunk" (1948), from notion of a thump ("bonk") on the head.
bonnet (n.) Look up bonnet at Dictionary.com
late 14c., Scottish bonat "brimless hat for men," from Old French bonet, short for chapel de bonet, from bonet (12c., Modern French bonnet) "kind of cloth used as a headdress," from Medieval Latin bonitum "material for hats," perhaps a shortening of Late Latin abonnis "a kind of cap" (7c.), which is perhaps from a Germanic source.
bonny (adj.) Look up bonny at Dictionary.com
1540s, of unknown origin, apparently from Old French bon, bone "good" (see bon).
bonnyclabber (n.) Look up bonnyclabber at Dictionary.com
1620s (in shortened form clabber), from Modern Irish bainne "milk" (from Middle Irish banne "drop," also, rarely, "milk"; cognate with Sanskrit bindu- "drop") + claba "thick." Compare Irish and Gaelic clabar "mud," which sometimes has made its way into English (Yeats, etc.).
bonsai Look up bonsai at Dictionary.com
1914, from Japanese bon "basin, pot" + sai "to plant."
bonus (n.) Look up bonus at Dictionary.com
1773, "Stock Exchange Latin" [Weekley], from Latin bonus "good" (adj.); see bene-. The correct noun form would be bonum. In U.S. history the bonus army was tens of thousands of World War I veterans and followers who marched on Washington, D.C., in 1932 demanding early redemption of their service bonus certificates (which carried a maximum value of $625).
bony (adj.) Look up bony at Dictionary.com
late 14c., from bone (n.) + -y (2).
boo (interj.) Look up boo at Dictionary.com
early 15c., boh, "A combination of consonant and vowel especially fitted to produce a loud and startling sound" [OED, which compares Latin boare, Greek boaein "to cry aloud, roar, shout"]; as an expression of disapproval, 1801 (n.), 1816 (v.); hence, the verb meaning "shower someone with boos" (1893).

Booing was common late 19c. among London theater audiences and at British political events; in Italy, Parma opera-goers were notorious boo-birds. But the custom seems to have been little-known in America before c. 1910. To say boo "open one's mouth, speak," originally was to say boo to a goose.
To be able to say Bo! to a goose is to be not quite destitute of courage, to have an inkling of spirit, and was probably in the first instance used of children. A little boy who comes across some geese suddenly will find himself hissed at immediately, and a great demonstration of defiance made by them, but if he can pluck up heart to cry 'bo!' loudly and advance upon them, they will retire defeated. The word 'bo' is clearly selected for the sake of the explosiveness of its first letter and the openness and loudness of its vowel. [Walter W. Skeat, "Cry Bo to a Goose," "Notes and Queries," 4th series, vi, Sept. 10, 1870]