Etymology
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eat (v.)

Old English etan (class V strong verb; past tense æt, past participle eten) "to consume food, devour, consume," from Proto-Germanic *etan (source also of Old Frisian ita, Old Saxon etan, Middle Dutch eten, Dutch eten, Old High German ezzan, German essen, Old Norse eta, Gothic itan), from PIE root *ed- "to eat."

Transferred sense of "corrode, wear away, consume, waste" is from 1550s. Meaning "to preoccupy, engross" (as in what's eating you?) first recorded 1893. Slang sexual sense of "do cunnilingus on" is first recorded 1927. The slang phrase eat one's words "retract, take back what one has uttered" is from 1570s; to eat one's heart out is from 1590s; for eat one's hat, see hat. Eat-in (adj.) in reference to kitchens is from 1955. To eat out "dine away from home" is from 1930.

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Definitions of eat

eat (v.)
take in solid food;
She was eating a banana
What did you eat for dinner last night?
eat (v.)
eat a meal; take a meal;
We did not eat until 10 P.M. because there were so many phone calls
I didn't eat yet, so I gladly accept your invitation
eat (v.)
take in food; used of animals only;
What do whales eat?
Synonyms: feed
eat (v.)
worry or cause anxiety in a persistent way;
What's eating you?
Synonyms: eat on
eat (v.)
use up (resources or materials);
Synonyms: consume / eat up / use up / deplete / exhaust / run through / wipe out
eat (v.)
cause to deteriorate due to the action of water, air, or an acid;
Synonyms: corrode / rust
From wordnet.princeton.edu