clubby (adj.) Look up clubby at Dictionary.com
"of a social disposition," 1859, from club (n.) in the associative sense + -y (2). Related: Clubbily; clubbiness.
cluck (v.) Look up cluck at Dictionary.com
Old English cloccian originally echoic. Compare Turkish culuk, one of the words for "turkey;" Greek klozein, Latin glocire, German glucken. Related: Clucked; clucking.
cluck (n.) Look up cluck at Dictionary.com
1703, "sound made by a hen," from cluck (v.). Slang meaning "stupid person" (turkeys are famously foolish) is from 1927.
clue (n.) Look up clue at Dictionary.com
1590s, spelling variant of clew "a ball of thread or yarn," in this sense with reference to the one Theseus used as a guide out of the Labyrinth. The purely figurative sense of "that which points the way" is from 1620s. As something which a bewildered person does not have, by 1948.
clue (v.) Look up clue at Dictionary.com
"to inform someone of the important facts," usually with in, 1934, from clue (n.). Related: Clued; cluing. Earlier in now-obsolete sense of "follow or track by clues" (1660s). In nautical use, "to haul up (a sail) by means of the clue-lines," from clue (n.) in the "wound ball of yarn" sense.
clueless (adj.) Look up clueless at Dictionary.com
1862, "trackless," from clue (n.) + -less. Meaning "ignorant, uninformed" is from 1943, said to be RAF slang from 1930s. Student slang use by 1985 is perhaps an independent extension along the same line. Related: Cluelessly; cluelessness.
clump (n.) Look up clump at Dictionary.com
1580s, "lump; cluster of trees," from Middle English clompe "a lump" (c.1300), from Dutch klomp "lump, mass," or Middle Low German klumpe "clog, wooden shoe." Old English had clympre "lump, mass of metal."
clump (v.2) Look up clump at Dictionary.com
"walk heavily," 1660s, imitative. Related: Clumped; clumping.
clump (v.1) Look up clump at Dictionary.com
"to heap or gather in clumps" (transitive), 1824, from clump (n.). Related: Clumped; clumping. Intransitive sense "to form a clump or clumps" is recorded from 1896.
clumperton (n.) Look up clumperton at Dictionary.com
"clown, clodhopper," 1530s, from clump (n.), probably on model of simpleton.
clumpy (adj.) Look up clumpy at Dictionary.com
1820, from clump (n.) + -y (2). Also noted 1881 in an Isle of Wight glossary as a noun meaning "a stupid fellow." Related: Clumpily; clumpiness. Compare also clumperton "clown, clodhopper" (1530s).
clumsy (adj.) Look up clumsy at Dictionary.com
1590s, "acting as if benumbed," alteration of Middle English clumsid "numb with cold" (14c.), past participle of clumsen "to benumb, stiffen or paralyze with cold or fear," from a Scandinavian source akin to Old Norse klumsa "make speechless, palsy; prevent from speaking," intensive of kluma "to make motionless." For insertion of -s-, see flimsy.

Not in general use until 18c., with senses "manifesting awkwardness; so made as to be unwieldy." Related: Clumsily; clumsiness. Compare Swedish dialectal klummsen "benumbed with cold," Norwegian klumsad (past participle) "speechless, palsied by a spasm or by fear or witchery;" German verklammen "grow stiff or numb with cold." Also compare clumse (n.) "a stupid fellow."
clung Look up clung at Dictionary.com
Old English clungen, past tense and past participle of cling.
clunk (v.) Look up clunk at Dictionary.com
1796, "to make the sound of a cork being pulled from a bottle;" imitative. This was the main sense through most of 19c. Meaning "to hit, strike" is attested from 1940s. Related: Clunked; clunking.
clunker (n.) Look up clunker at Dictionary.com
"anything inferior," 1940s, agent noun from clunk (v.), probably in imitation of the sounds made by old machinery. Specific sense of "old car" was in use by 1951 (clunk in the sense "old worn-out machine" is from 1940s).
clunky (adj.) Look up clunky at Dictionary.com
"blocky, ungraceful," by 1968 (when it was the name of a style of women's shoe), from clunk + -y (2). Related: Clunkily; clunkiness.
cluster (n.) Look up cluster at Dictionary.com
Old English clyster "cluster," probably from the same root as clot (n.). Of stars, from 1727. Cluster-bomb attested from 1967.
cluster (v.) Look up cluster at Dictionary.com
late 14c. (transitive), from cluster (n.). Intransitive sense from 1540s. Related: Clustered; clustering.
clusterfuck (n.) Look up clusterfuck at Dictionary.com
"bungled or confused undertaking," 1969, U.S. military slang, from cluster + fuck, probably in the "bungle" sense. Earlier the compound meant "orgy" (1966).
clutch (v.) Look up clutch at Dictionary.com
Old English clyccan "bring together, bend (the fingers), clench," from PIE *klukja- (cognates: Swedish klyka "clamp, fork;" related to cling). Meaning "to grasp" is early 14c.; that of "to seize with the claws or clutches" is from late 14c. Sense of "hold tightly and close" is from c.1600. Influenced in meaning by Middle English cloke "a claw." Related: Clutched; clutching.
clutch (n.3) Look up clutch at Dictionary.com
"a brood, a nest" in reference to chickens, eggs, 1721, from clekken "to hatch" (c.1400). Said by OED to be apparently a southern England dialect word. Compare batch/bake. Probably from a Scandinavian source (such as Old Norse klekja "to hatch"), perhaps of imitative origin (compare cluck (v.)).
clutch (n.1) Look up clutch at Dictionary.com
"a claw, grip, grasp," c.1300, from cloche "claw," from cloke (c.1200), related to clucchen, clicchen (see clutch (v.)). Meaning "grasping hand" (1520s) led to that of "tight grasp" (1784). Related: Clutches.
clutch (n.2) Look up clutch at Dictionary.com
movable mechanical part for transmitting motion, 1814, from clutch (v.), with the "seizing" sense extended to "device for bringing working parts together." Originally of mill-works, first used of motor vehicles 1899. Meaning "moment when heroics are required" is attested from 1920s.
clutter (v.) Look up clutter at Dictionary.com
1550s, "to collect in heaps," variant of clotern "to form clots, to heap on" (c.1400); related to clot (n.). Sense of "to litter" is first recorded 1660s. Related: Cluttered; cluttering.
clutter (n.) Look up clutter at Dictionary.com
1570s, "things lying in heaps or confusion," from clutter (v.); the "litter" sense is from 1660s.
Clyde Look up Clyde at Dictionary.com
masc. proper name, from the family name, from the region of the Clyde River in Scotland (see Clydesdale). Most popular in U.S. for boys c.1890-1910, falling off rapidly thereafter, hence probably its use in 1940s teenager slang for "a square, one not versed in popular music or culture."
Clydesdale Look up Clydesdale at Dictionary.com
"breed of heavy draught horses," 1786, so called because they were bred in the valley of the Clyde in Scotland. The river name is perhaps literally "cleansing," from a Celtic root akin to Latin cloaca (see cloaca).
clyster (n.) Look up clyster at Dictionary.com
from French clystère (Old French clistre, 13c.) or directly from Latin clyster, from Greek klyster, from klyzein "to wash out" (see cloaca).
Clytaemnestra Look up Clytaemnestra at Dictionary.com
also Clytemnestra, wife and murderess of Agamemnon, from Greek Klytaimnestra, from klytos "celebrated, heard of" (see loud) + mnester "wooer, suitor," literally "willing to mind, mindful of," related to mnasthai "to remember," from PIE root *men- "to think" (see mind (n.)).
cn- Look up cn- at Dictionary.com
consonant group used in Old English (the Clark Hall dictionary has 82 entries under cn-) but in Middle English all lost or turned to kn-. Also common in Greek, and retained in the spelling of some English words from Greek but not now admitted in speech, the n- only being sounded.
Cnidaria (n.) Look up Cnidaria at Dictionary.com
phylum of stinging invertebrates, from Latinized form of Greek knide "nettle," from stem of knizein "to scratch scrape," + abstract noun ending -ia. Related: Cnidarian.
co- Look up co- at Dictionary.com
in Latin, the form of com- in compounds with stems beginning in vowels and h- and gn- (see com-). Taken in English from 17c. as a living prefix meaning "together, mutually, in common," and used promiscuously with native words and Latin-derived words not beginning with vowels, sometimes even with words already having it (such as co-conspiritor).
co-ed (n.) Look up co-ed at Dictionary.com
also coed, 1886, American English, (first in Louisa Mae Alcott's "Jo's Boys"); short for "co-educational system;" 1889 as an adjective, short for coeducational; 1893 as a noun meaning "girl or woman student at a co-educational institution."
co-op (n.) Look up co-op at Dictionary.com
1861, abbreviation of cooperative. The hyphen is needed to avoid confusion with coop (n.).
co-opt (v.) Look up co-opt at Dictionary.com
1650s, "to select (someone) for a group or club by a vote of members," from Latin cooptare "to elect, to choose as a colleague or member of one's tribe," from com- "together" (see com-) + optare "choose" (see option (n.)). For some reason this defied the usual pattern of Latin-to-English adaptation, which should have yielded *cooptate. Sense of "take over" is first recorded c.1953. Related: Co-opted; co-opting.
co-ordinate Look up co-ordinate at Dictionary.com
see coordinate.
co-star Look up co-star at Dictionary.com
also costar, 1919 as a verb; 1926 as a noun, from co- + star (v.).
co. Look up co. at Dictionary.com
abbreviation of company, attested by 1670s.
coach (n.) Look up coach at Dictionary.com
1550s, "large kind of carriage," from Middle French coche (16c.), from German kotsche, from Hungarian kocsi (szekér) "(carriage) of Kocs," village where it was first made. In Hungary, the thing and the name for it date from 15c., and forms are found in most European languages (Spanish and Portuguese coche, Italian cocchino, Dutch koets). Applied to railway cars 1866, American English. Sense of "economy or tourist class" is from 1949. Meaning "instructor/trainer" is c.1830 Oxford University slang for a tutor who "carries" a student through an exam; athletic sense is 1861.
coach (v.) Look up coach at Dictionary.com
1610s, "to convey in a coach," from coach (n.). Meaning "to prepare (someone) for an exam" is from 1849. Related: Coached; coaching.
coachman (n.) Look up coachman at Dictionary.com
1570s, from coach (n.) + man (n.).
coagulant (n.) Look up coagulant at Dictionary.com
1770, from Latin coagulantem (nominative coagulans), present participle of coagulare (see coagulate).
coagulate (v.) Look up coagulate at Dictionary.com
early 15c., from Latin coagulatus, past participle of coagulare "to cause to curdle," from cogere "to curdle, collect" (see cogent). Earlier coagule, c.1400, from Middle French coaguler. Related: Coagulated; coagulating.
coagulation (n.) Look up coagulation at Dictionary.com
c.1400, from Latin coagulationem (nominative coagulatio), noun of action from past participle stem of coagulare (see coagulate).
coal (n.) Look up coal at Dictionary.com
Old English col "charcoal, live coal," from Proto-Germanic *kula(n) (cognates: Old Frisian kole, Middle Dutch cole, Dutch kool, Old High German chol, German Kohle, Old Norse kol), from PIE root *g(e)u-lo- "live coal" (cognates: Irish gual "coal").

Meaning "mineral consisting of fossilized carbon" is from mid-13c. First mentioned (370 B.C.E.) by Theophrastus in his treatise "On Stones" under the name lithos anthrakos (see anthrax). Traditionally good luck, coal was given as a New Year's gift in England, said to guarantee a warm hearth for the coming year. The phrase drag (or rake) over the coals was a reference to the treatment meted out to heretics by Christians. To carry coals "do dirty work," also "submit to insult" is from 1520s. To carry coals to Newcastle (c.1600) Anglicizes Greek glauk eis Athenas "owls to Athens."
coalesce (v.) Look up coalesce at Dictionary.com
1540s, from Latin coalescere "to unite, grow together, become one in growth," from com- "together" (see co-) + alescere "to grow up" (see adolescent). Related: Coalesced; coalescing; coalescence; coalescent.
coalition (n.) Look up coalition at Dictionary.com
1610s, "the growing together of parts," from French coalition (1540s), from Late Latin coalitus "fellowship," originally past participle of Latin coalescere (see coalesce). First used in a political sense 1715.
coaming (n.) Look up coaming at Dictionary.com
1610s, nautical, of unknown origin.
coarse (adj.) Look up coarse at Dictionary.com
early 15c., cors "ordinary" (modern spelling is from late 16c.), probably adjectival use of noun cours (see course (n.)), originally referring to rough cloth for ordinary wear. Developed a sense of "rude" c.1500 and "obscene" by 1711. Perhaps related, via metathesis, to French gros, which had a similar sense development. Related: Coarsely; coarseness.
coarsen (v.) Look up coarsen at Dictionary.com
1805, from coarse + -en (2). Related: Coarsened; coarsening.