Old English locian "use the eyes for seeing, gaze, look, behold, spy," from West Germanic *lokjan (cf. Old Saxon lokon "see, look, spy," Middle Dutch loeken "to look," Old High German luogen, German dialectal lugen "to look out"), of unknown origin, perhaps cognate with Breton lagud "eye." In Old English, usually with on; the use of at began 14c. Meaning "seek, search out" is c.1300; meaning "to have a certain appearance" is from c.1400. Of objects, "to face in a certain direction," late 14c.
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; look up "research in books or papers" is from 1690s. To look down upon in the figurative sense is from 1711; to look down one's nose is from 1921. To look forward "anticipate" is c.1600; meaning "anticipate with pleasure" is mid-19c. To not look back "make no pauses" is colloquial, first attested 1893. In look sharp (1711) sharp originally was an adverb, "sharply."
c.1200, "act or action of looking," from look (v.). Meaning "appearance of a person" is from late 14c. Expression if looks could kill ... attested by 1827 (if looks could bite is attested from 1747).
Old English nosu, from Proto-Germanic *nusus (cf. Old Norse nös, Old Frisian nose, Dutch neus, Old High German nasa, German Nase), from PIE *nas- "nose" (cf. Sanskrit nasa, Old Persian naham, Old Church Slavonic nasu, Lithuanian nosis, Latin nasus "nose"). Used of any prominent or projecting part from 1530s. (nose cone in the space rocket sense is from 1949). Used to indicate "something obvious" from 1590s. Meaning "odor, scent" is from 1894.
Kiv, It could bee no other then his owne manne, that had thrust his nose so farre out of ioynte. ["Barnabe Riche His Farewell to Military Profession," 1581]Pay through the nose (1670s) seems to suggest "bleed." Many extended meanings are from the horse-racing sense of "length of a horse's nose," as a measure of distance between two finishers (1908). To turn up one's nose "show disdain" is from 1818 (earlier hold up one's nose, 1570s); similar notion in look down one's nose (1921). To say something is under (one's) nose "in plain view" is from 1540s.
"perceive the smell of," 1570s; "pry, search," 1640s, from nose (n.). Related: Nosed; nosing.
The part of the human face or the forward part of the head of other vertebrates that contains the nostrils and organs of smell and forms the beginning of the respiratory tract.
A police informer; stool pigeon (1830+ Underworld)
bluenose, by a nose, dog's-nose, hard-nosed, have a bug up one's ass, keep one's nose clean, look down one's nose, no skin off my ass, on the nose, pay through the nose, poke one's nose into something,powder one's nose, put someone's nose out of joint