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.

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.

Definitions of look
look (v.)
perceive with attention; direct one's gaze towards;
She looked over the expanse of land
look (v.)
give a certain impression or have a certain outward aspect;
This project looks fishy
Synonyms: appear / seem
look (v.)
have a certain outward or facial expression;
She looked pale after the surgery
How does she look?
The child looks unhappy
look (v.)
search or seek;
We looked all day and finally found the child in the forest
Synonyms: search
look (v.)
be oriented in a certain direction, often with respect to another reference point; be opposite to;
The house looks north
My backyard look onto the pond
Synonyms: front / face
look (v.)
take charge of or deal with;
Synonyms: attend / take care / see
look (v.)
convey by one's expression;
She looked her devotion to me
look (v.)
look forward to the probable occurrence of;
She is looking to a promotion
Synonyms: expect / await / wait
look (v.)
accord in appearance with;
You don't look your age!
look (v.)
have faith or confidence in;
Synonyms: count / bet / depend / swear / rely / bank / calculate / reckon
look (n.)
the feelings expressed on a person's face;
a look of triumph
Synonyms: expression / aspect / facial expression / face
look (n.)
the act of directing the eyes toward something and perceiving it visually;
he gave it a good looking at
he went out to have a look
his look was fixed on her eyes
his camera does his looking for him
Synonyms: looking / looking at
look (n.)
physical appearance;
I don't like the looks of this place
look (n.)
the general atmosphere of a place or situation and the effect that it has on people;
Synonyms: spirit / tone / feel / feeling / flavor / flavour / smell