bug off (v.) Look up bug off at Dictionary.com
by 1956, perhaps from bugger off (see bugger (v.)), which chiefly is British (by 1920s) but was picked up in U.S. Air Force slang in the Korean War.
bugaboo (n.) Look up bugaboo at Dictionary.com
1843, earlier buggybow (1740), probably an alteration of bugbear (also see bug (n.)), but connected by Chapman ["Dictionary of American Slang"] with Bugibu, demon in the Old French poem "Aliscans" from 1141, which is perhaps of Celtic origin (compare Cornish bucca-boo, from bucca "bogle, goblin").
bugbear (n.) Look up bugbear at Dictionary.com
1580s, a sort of demon in the form of a bear that eats small children, also "object of dread" (whether real or not), from obsolete bug "goblin, scarecrow" (see bug (n.)) + bear (n.).
bugger (n.) Look up bugger at Dictionary.com
"sodomite," 1550s, earlier "heretic" (mid-14c.), from Medieval Latin Bulgarus "a Bulgarian" (see Bulgaria), so called from bigoted notions of the sex lives of Eastern Orthodox Christians or of the sect of heretics that was prominent there 11c. Compare Old French bougre "Bulgarian," also "heretic; sodomite." Softened secondary sense of "fellow, chap," is in British English from mid-19c. Related: Buggerly.
bugger (v.) Look up bugger at Dictionary.com
to commit buggery," 1590s, from bugger (n.). Meaning "ruin, spoil" is from 1923. Related: Buggered; buggering.
buggery (n.) Look up buggery at Dictionary.com
mid-14c., "heresy," from Old French bougrerie, from bougre "heretic" (see bugger (n.)). Later "unnatural intercourse" with man or beast, "carnalis copula contra Naturam, & hoc vel per confusionem Specierum;" from bugger (n.) + -y (4).
buggy (n.) Look up buggy at Dictionary.com
"light carriage," 1773, of unknown origin. Extended to baby carriages by 1890.
buggy (adj.) Look up buggy at Dictionary.com
"infested with bugs," 1774, from bug (n.) + -y (2).
bughouse Look up bughouse at Dictionary.com
1902 (n.) "insane asylum;" 1891 (adj.) "insane," from bug (n.) + house (n.); perhaps originally tramps' slang.
bugle (v.) Look up bugle at Dictionary.com
1852, from bugle (n.). Related: Bugled; bugling (1847). Also compare bugler.
bugle (n.) Look up bugle at Dictionary.com
mid-14c., abbreviation of buglehorn "musical horn, hunting horn" (c. 1300), from Old French bugle "(musical) horn," also "wild ox, buffalo," from Latin buculus "heifer, young ox," diminutive of bos "ox, cow" (from PIE root *gwou- "ox, bull, cow"). Middle English also had the word in the "buffalo" sense and it survived in dialect with meaning "young bull." Modern French bugle is a 19c. borrowing from English.
bugler (n.) Look up bugler at Dictionary.com
1793; see bugle (n.). Bugle-boy attested from 1817.
bugloss (n.) Look up bugloss at Dictionary.com
1530s, from French buglosse, from Latin buglossa, from Greek bouglossos, literally "ox-tongued," from bous "ox" (from PIE root *gwou- "ox, bull, cow") + glossa "tongue" (see gloss (n.2)) . So called from the shape of its leaves.
build (n.) Look up build at Dictionary.com
"style of construction," 1660s, from build (v.). Earlier in this sense was built (1610s). Meaning "physical construction and fitness of a person" attested by 1981. Earliest sense, now obsolete, was "a building" (early 14c.).
build (v.) Look up build at Dictionary.com
late Old English byldan "construct a house," verb form of bold "house," from Proto-Germanic *buthla- (source also of Old Saxon bodl, Old Frisian bodel "building, house"), from PIE *bhu- "to dwell," from root*bheue- "to be, exist, grow." Rare in Old English; in Middle English it won out over more common Old English timbran (see timber). Modern spelling is unexplained. Figurative use from mid-15c. Of physical things other than buildings from late 16c. Related: Builded (archaic); built; building.
In the United States, this verb is used with much more latitude than in England. There, as Fennimore Cooper puts it, everything is BUILT. The priest BUILDS up a flock; the speculator a fortune; the lawyer a reputation; the landlord a town; and the tailor, as in England, BUILDS up a suit of clothes. A fire is BUILT instead of made, and the expression is even extended to individuals, to be BUILT being used with the meaning of formed. [Farmer, "Slang and Its Analogues," 1890]
build-up (n.) Look up build-up at Dictionary.com
also buildup, 1927, "accumulation of positive publicity," from build (v.) + up (adv.). Of any accumulation (but especially military) from 1943.
builder (n.) Look up builder at Dictionary.com
late 13c., agent noun from build (v.).
building (n.) Look up building at Dictionary.com
c. 1300, "a structure;" late 14c., "act or process of constructing," verbal noun from build (v.).
built (adj.) Look up built at Dictionary.com
1560s, "constructed, erected," past participle adjective from build (v.). Meaning "physically well-developed" is by 1940s (well-built in reference to a woman is from 1871); Built-in (adj.) is from 1898.
bulb (n.) Look up bulb at Dictionary.com
1560s, "an onion," from Middle French bulbe (15c.), from Latin bulbus "bulb, bulbous root, onion," from Greek bolbos "plant with round swelling on underground stem." Expanded by 1800 to "swelling in a glass tube" (thermometer bulb, light bulb, etc.).
bulbous (adj.) Look up bulbous at Dictionary.com
1570s, "pertaining to a bulb," from Latin bulbosus, from bulbus (see bulb). Meaning "bulb-shaped" is recorded from 1783. Related: Bulbously; bulbousness.
Bulgar (n.) Look up Bulgar at Dictionary.com
1759, "inhabitant of Bulgaria" (Bulgarian is attested from 1550s), from Medieval Latin Bulgarus (see Bulgaria).
Bulgaria (n.) Look up Bulgaria at Dictionary.com
Medieval Latin, from Bulgari "Bulgarians," perhaps literally "the men from the Bolg," the River Volga, upon whose banks they lived until 6c. But the people's name for themselves in Old Bulgarian was Blugarinu, according to OED, which suggests a different origin. In other sources [such as Room], the name is said to be ultimately from Turkic bulga "mixed," in reference to the nature of this people of Turko-Finnish extraction but Slavic language.
Bulgarian (n.) Look up Bulgarian at Dictionary.com
1550s, from Bulgaria + -ian.
bulge (v.) Look up bulge at Dictionary.com
"to protrude, swell out," 1670s, from bulge (n.). Related: Bulged; bulging.
bulge (n.) Look up bulge at Dictionary.com
c. 1200, "wallet, leather bag," from Old French bouge, boulge "wallet, pouch, leather bag," or directly from Latin bulga "leather sack," from PIE *bhelgh- "to swell," extended form of root *bhel- (2) "to blow, swell." Sense of "a swelling" is first recorded 1620s. Bilge (q.v.) might be a nautical variant.
bulgur (n.) Look up bulgur at Dictionary.com
cereal food, from Turkish bulghur, bulgar.
bulimia (n.) Look up bulimia at Dictionary.com
1976, Modern Latin, from Greek boulimia, "ravenous hunger" as a disease, literally "ox-hunger," from bou-, intensive prefix (originally from bous "ox;" from PIE root *gwou- "ox, bull, cow") + limos "hunger," from PIE root *leie- "to waste away." As a psychological disorder, technically bulemia nervosa. Englished bulimy was used from late 14c. in a medical sense of "ravishing hunger."
bulimic (adj.) Look up bulimic at Dictionary.com
1854, "voracious;" see bulimia + -ic. Meaning "suffering from bulimia nervosa" is recorded from 1977. The noun in this sense is from 1980.
bulk (v.) Look up bulk at Dictionary.com
"swell, become more massive," 1550s (usually with up), from bulk (n.). Related: Bulked; bulking.
bulk (n.) Look up bulk at Dictionary.com
mid-15c., "a heap," earlier "ship's cargo" (mid-14c.), from a Scandinavian source akin to Old Norse bulki "a heap; ship's cargo," thus "goods loaded loose" (perhaps literally "rolled-up load"), from Proto-Germanic *bul-, from PIE root *bhel- (2) "to blow, swell."

Meaning extended by confusion with obsolete bouk "belly" (from Old English buc "body, belly," from Proto-Germanic *bukaz; see bucket), which led to sense of "size," first attested mid-15c.
bulkhead (n.) Look up bulkhead at Dictionary.com
late 15c., with head (n.); the first element perhaps from bulk "framework projecting in the front of a shop" (1580s), which is perhaps from Old Norse bolkr "beam, balk" (see balk (n.)).
bulky (adj.) Look up bulky at Dictionary.com
mid-15c., "plump, stout," from bulk (n.) + -y (2). Related: Bulkiness.
bull (v.) Look up bull at Dictionary.com
"push through roughly," 1884, from bull (n.1). Related: Bulled; bulling.
bull (n.3) Look up bull at Dictionary.com
"false talk, fraud," Middle English, apparently from Old French bole "deception, trick, scheming, intrigue," and perhaps connected to modern Icelandic bull "nonsense."
Sais christ to ypocrites ... yee ar ... all ful with wickednes, tresun and bull. ["Cursor Mundi," early 14c.]
There also was a verb bull meaning "to mock, cheat," which dates from 1530s.
bull (n.2) Look up bull at Dictionary.com
"papal edict," c. 1300, from Medieval Latin bulla "sealed document" (source of Old French bulle, Italian bulla), originally the word for the seal itself, from Latin bulla "round swelling, knob," said ultimately to be from Gaulish, from PIE *beu-, a root supposed to have formed words associated with swelling (source also of Lithuanian bule "buttocks," Middle Dutch puyl "bag," also possibly Latin bucca "cheek").
bull (n.1) Look up bull at Dictionary.com
"bovine male animal," from Old English bula "a bull, a steer," or Old Norse boli "bull," both from Proto-Germanic *bullon- (source also of Middle Dutch bulle, Dutch bul, German Bulle), perhaps from a Germanic verbal stem meaning "to roar," which survives in some German dialects and perhaps in the first element of boulder (q.v.). The other possibility [Watkins] is that the Germanic word is from PIE root *bhel- (2) "to blow, swell."

An uncastrated male, reared for breeding, as opposed to a bullock or steer. Extended after 1610s to males of other large animals (elephant, alligator, whale, etc.). Stock market sense is from 1714 (see bear (n.)). Meaning "policeman" attested by 1859. Figurative phrase to take the bull by the horns first recorded 1711. To be a bull in a china shop, figurative of careless and inappropriate use of force, attested from 1812 and was the title of a popular humorous song in 1820s England. Bull-baiting attested from 1570s.
bull-dyke (n.) Look up bull-dyke at Dictionary.com
also bulldyke, 1926, from bull (n.1) + dyke.
bull-headed (adj.) Look up bull-headed at Dictionary.com
also bullheaded, "obstinate," 1818, from bull (n.1) + -headed.
bull-ring (n.) Look up bull-ring at Dictionary.com
arena for bull fights, c. 1600, from bull (n.1) + ring (n.1).
bulla (n.) Look up bulla at Dictionary.com
1876, from Latin bulla (plural bullae), literally "bubble" (see bull (n.2)).
bulldog (n.) Look up bulldog at Dictionary.com
c. 1500, from bull (n.1) + dog (n.). Perhaps from shape, perhaps because originally used for baiting bulls.
bulldoze (v.) Look up bulldoze at Dictionary.com
by 1880, from an earlier noun, bulldose "a severe beating or lashing" (1876), literally "a dose fit for a bull," a slang word referring to the intimidation beating of black voters (by either blacks or whites) in the chaotic 1876 U.S. presidential election. See bull (n.1) + dose (n.). Related: Bulldozed; bulldozing.
bulldozer (n.) Look up bulldozer at Dictionary.com
"person who intimidates by violence," 1876, agent noun from bulldoze (q.v.). Meaning extended to ground-clearing caterpillar tractor in 1930.
bullet (n.) Look up bullet at Dictionary.com
1550s, from Middle French boulette "cannonball, small ball," diminutive of boule "a ball" (13c.), from Latin bulla "round thing, knob" (see bull (n.2)). Earliest version of bite the bullet recorded 1891, probably with a sense of giving someone a soft lead bullet to clench in the teeth during a painful operation.
bulletin (n.) Look up bulletin at Dictionary.com
1765, from French bulletin (16c.), modeled on Italian bulletino, diminutive of bulletta "document, voting slip," itself a diminutive of Latin bulla (see bull (n.2)) with equivalent of Old French -elet (see -let). The word was used earlier in English in the Italian form (mid-17c.). Popularized by their use in the Napoleonic Wars as the name for dispatches sent from the front and meant for the home public (which led to the proverbial expression as false as a bulletin). Bulletin board is from 1831.
bullfinch (n.) Look up bullfinch at Dictionary.com
1560s, from bull (n.1) + finch; supposedly so called for the shape of its head and neck; compare French bouvreuil.
bullfrog (n.) Look up bullfrog at Dictionary.com
also bull-frog, 1738, from bull (n.1) + frog (n.1). So called for its voice.
bullied (adj.) Look up bullied at Dictionary.com
1851, past participle adjective from bully (v.).
bullion (n.) Look up bullion at Dictionary.com
early 15c., "uncoined gold or silver," from Anglo-French bullion "bar of precious metal," also "place where coins are made, mint," perhaps, through the notion of "melting," from Old French boillir "to boil," from Latin bullire "boil" (see boil (v.)). But perhaps it is rather from Old French bille "stick, block of wood" (see billiards).