Etymology
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look (v.)

Old English locian "use the eyes for seeing, gaze, look, behold, spy," from West Germanic *lokjan (source also of Old Saxon lokon "see, look, spy," Middle Dutch loeken "to look," Old High German luogen, German dialectal lugen "to look out"), a word of unknown origin. Breton lagud "eye" has been suggested as a possible cognate.

In Old English, usually with on; the use of at began 14c. As a word to call attention, c. 1200 (look out! "take notice" is from mid-15c.). Meaning "seek, search out" is c. 1300; meaning "to have a certain appearance, express or manifest by looks" is from c. 1400. Of objects, "to face in a certain direction," late 14c. To look like "have the appearance of" is from mid-15c. Look after "take care of" is from late 14c., earlier "to seek" (c. 1300), "to look toward" (c. 1200). Look into "investigate" is from 1580s. To look forward "anticipate" is c. 1600; especially "anticipate with pleasure" from mid-19c. To look over "scrutinize" is from mid-15c.

Look up is from c. 1200 in literal sense "raise the eyes;" as "research in books or papers" from 1690s. To look up to "regard with respect and veneration" is from 1719. To look down upon in the figurative sense "regard as beneath one" is from 1711; to look down one's nose is from 1921. To not look back "make no pauses" is colloquial, first attested 1893. In look sharp (1711), sharp originally was an adverb, "sharply." To look around "search about, look round" is from 1883.

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look (n.)
late Old English, "act or action of looking," from look (v.). Meaning "a particular instance of looking, a glance," especially one which conveys a certain feeling is from early 14c. Meaning "appearance of a person, visual or facial expression" is from late 14c. Looks with the same sense as the singular is from 1560s. Expression if looks could kill ..., of one seething silently, is attested by 1827 (if looks could bite is attested from 1747). Fashion sense "totality of appearance" is from 1938.
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look-alike (n.)
"someone who closely resembles another," 1937, American English, from look (v.) + alike.
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look-see (n.)
"inspection," 1865, "Pidgin-like formation" [OED], first used in representations of English as spoken by Chinese, from look (v.) + see (v.).
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good-looking (adj.)
"attractive, of pleasing appearance," 1742; see good (adj.) + look (v.). Good looks (n.) "attractive appearance" is attested from 1712.
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lookout (n.)
also look-out, "person who stands watch or acts as a scout," 1690s, from verbal phrase look out "be on the watch" (c. 1600), from look (v.) + out (adv.).
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lookdown (n.)
type of sea fish, 1882, from look (v.) + down (adv.). So called from facial structure. Also known as moonfish, horsehead.
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unlooked (adj.)
c. 1300, "neglected," from un- (1) "not" + past participle of look (v.). With for, "unexpected," attested from 1530s.
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looking (n.)
late 12c., "the action of looking," verbal noun from look (v.). From late 13c. as "look in the eyes, facial expression;" also "personal appearance, aspect." Looking-glass is from 1520s. The noun looking-in (1926) was an old expression for "television viewing."
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onlooker (n.)

"spectator, one who observes but does not participate," c. 1600, from on + agent noun from look (v.). Old English had a verb onlocian, but the modern verb onlook (1867) appears to be a back-formation from onlooker.

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