come (v.)youdaoicibaDictYouDict[come 词源字典]
Old English cuman "come, approach, land; come to oneself, recover; arrive; assemble" (class IV strong verb; past tense cuom, com, past participle cumen), from Proto-Germanic *kwem- (cognates: Old Saxon cuman, Old Frisian kuma, Middle Dutch comen, Dutch komen, Old High German queman, German kommen, Old Norse koma, Gothic qiman), from PIE root *gwa-, *gwem- "to go, come" (cognates: Sanskrit gamati "he goes," Avestan jamaiti "goes," Tocharian kakmu "come," Lithuanian gemu "to be born," Greek bainein "to go, walk, step," Latin venire "to come").

The substitution of Middle English -o- for Old English -u- before -m-, -n-, or -r- was a scribal habit before minims to avoid misreading the letters in the old style handwriting, which jammed letters. The practice similarly transformed some, monk, tongue, worm. Modern past tense form came is Middle English, probably from Old Norse kvam, replacing Old English cuom.

Remarkably productive with prepositions (NTC's "Dictionary of Phrasal Verbs" lists 198 combinations); consider the varied senses in come to "regain consciousness," come over "possess" (as an emotion), come at "attack," come on (interj.) "be serious," and come off "occur." For sexual senses, see cum.[come etymology, come origin, 英语词源]
comeback (n.)youdaoicibaDictYouDict
"verbal retort," 1889, from come + back (adj.). Meaning "recovery, return to former position or condition after retirement or loss" is attested from 1908, American English.
comedian (n.)youdaoicibaDictYouDict
1580s, "comic poet," later (c. 1600) "stage actor in comedies," also, generally, "actor," from Middle French comédien, from comédie (see comedy). Meaning "professional joke-teller, etc." is from 1898.
comedic (adj.)youdaoicibaDictYouDict
1630s, from Latin comoedicus, from Greek komoidikos "pertaining to comedy," from komoidia (see comedy).
comedienne (n.)youdaoicibaDictYouDict
1860, from French comédienne, fem. of comédien (see comedian).
comedo (n.)youdaoicibaDictYouDict
"blackhead," etc., 1866, from Latin comedo "glutton," from comedere "to eat up" (see comestible). A name formerly given to worms that devour the body; transferred in medical use to secretions that resemble them.
comedy (n.)youdaoicibaDictYouDict
late 14c., from Old French comedie (14c., "a poem," not in the theatrical sense), from Latin comoedia, from Greek komoidia "a comedy, amusing spectacle," probably from komodios "actor or singer in the revels," from komos "revel, carousal, merry-making, festival," + aoidos "singer, poet," from aeidein "to sing," related to oide (see ode).
The passage on the nature of comedy in the Poetic of Aristotle is unfortunately lost, but if we can trust stray hints on the subject, his definition of comedy (which applied mainly to Menander) ran parallel to that of tragedy, and described the art as a purification of certain affections of our nature, not by terror and pity, but by laughter and ridicule. [Rev. J.P. Mahaffy, "A History of Classical Greek Literature," London, 1895]
The classical sense of the word, then, was "amusing play or performance," which is similar to the modern one, but in the Middle Ages the word came to mean poems and stories generally (albeit ones with happy endings), and the earliest English sense is "narrative poem" (such as Dante's "Commedia"). Generalized sense of "quality of being amusing" dates from 1877.
Comedy aims at entertaining by the fidelity with which it presents life as we know it, farce at raising laughter by the outrageous absurdity of the situation or characters exhibited, & burlesque at tickling the fancy of the audience by caricaturing plays or actors with whose style it is familiar. [Fowler]
comely (adj.)youdaoicibaDictYouDict
"beautiful, handsome," c. 1400, probably from Old English cymlic "lovely, splendid, finely made," from cyme "exquisite, glorious, delicate," from West Germanic *kumi- "delicate, feeble" (cognates: Old High German chumo "with difficulty," chumig "weak, delicate;" German kaum "hardly, scarcely"). Or perhaps the modern word is from Middle English bicumelic (c. 1200) "suitable, exquisite," literally "becomely" (compare becoming).
comer (n.)youdaoicibaDictYouDict
"visitor," mid-14c., agent noun from come. Meaning "one showing promise" is attested from 1879. Phrase all comers "everyone who chooses to come" is recorded from 1560s.
comestible (n.)youdaoicibaDictYouDict
1837, "article of food," from French comestible (14c.), from Late Latin comestibilis, from Latin comestus, past participle of comedere "eat up, consume," from com- "thoroughly" (see com-) + edere "to eat" (see edible). It was attested earlier as an adjective (late 15c.) meaning "fit to eat" but seems to have fallen from use 17c., and the word was reintroduced from French.
comet (n.)youdaoicibaDictYouDict
c. 1200, from Old French comete (12c., Modern French comète), from Latin cometa, from Greek (aster) kometes, literally "long-haired (star)," from kome "hair of the head" (compare koman "let the hair grow long"), which is of unknown origin. So called from resemblance of a comet's tail to streaming hair.
cometh (v.)youdaoicibaDictYouDict
obsolete or poetic 2nd and 3rd person singular of come, from Old English cymeð.
comeuppance (n.)youdaoicibaDictYouDict
also comeupance, 1859, presumably rooted in verbal phrase come up "present oneself for judgment before a tribunal" + -ance.
comfit (n.)youdaoicibaDictYouDict
early 14c., "sugarplum," from Old French confit "preserved fruit," from Latin confectum, from confectionem (see confection).
comfort (v.)youdaoicibaDictYouDict
late 13c., conforten "to cheer up, console," from Old French conforter "to comfort, to solace; to help, strengthen," from Late Latin confortare "to strengthen much" (used in Vulgate), from Latin com-, intensive prefix (see com-), + fortis "strong" (see fort). Change of -n- to -m- began in English 14c. Related: Comforted; comforting.
comfort (n.)youdaoicibaDictYouDict
c. 1200, "feeling of relief" (as still in to take comfort in something); also "source of alleviation or relief;" from Old French confort (see comfort (v.)). Replaced Old English frofor. Comforts (as opposed to necessities and luxuries) is from 1650s.
comfortable (adj.)youdaoicibaDictYouDict
mid-14c., "affording mental comfort," from Anglo-French confortable, from conforter "to comfort" (see comfort (v.)); also see -able. Meaning "offering physical comfort" is attested from 1769; that of "in a state of tranquil enjoyment" is from 1770.
comfortably (adv.)youdaoicibaDictYouDict
late 14c., "pleasantly, enjoyably," from comfortable + -ly (2). Meaning "in a state of comfort" is 1630s.
comforter (n.)youdaoicibaDictYouDict
mid-14c., "one who consoles or comforts," from Anglo-French confortour (Old French comforteor), from Vulgar Latin *confortatorem, agent noun from Late Latin confortare (see comfort (v.)). As a kind of scarf, from 1823; as a kind of coverlet, from 1832.
comfy (adj.)youdaoicibaDictYouDict
1829, colloquial shortening of comfortable.