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eat (ēt)
v. ate (āt), eat·en (ētn), eat·ing, eats
a. To take into the body by the mouth for digestion or absorption.
b. To take in and absorb as food: a plant that eats insects; a cell that eats bacteria.
c. To include habitually or by preference in one's diet: a bird that eats insects, fruit, and seeds; stopped eating red meat on advice from her doctor.
2. To destroy, ravage, or use up by or as if by ingesting: "Covering news in the field eats money" (George F. Will).
3. To erode or corrode: waves that ate away the beach; an acid that eats the surface of a machine part.
4. To produce by eating: Moths ate holes in our sweaters.
5. Slang To absorb the cost or expense of: "You can eat your loss and switch the remaining money to other investment portfolios" (Marlys Harris).
6. Informal To bother or annoy: What's eating him?
7. Vulgar slang To perform cunnilingus or anilingus on. Often used with out.
a. To consume food.
b. To have or take a meal.
2. To exercise a consuming or eroding effect: a drill that ate away at the rock; exorbitant expenses that were eating into profits.
3. To cause persistent annoyance or distress: "How long will it be before the frustration eats at you?" (Howard Kaplan).
Phrasal Verb:
eat up Slang
1. To receive or enjoy enthusiastically or avidly: She really eats up the publicity.
2. To believe without question: He'll eat up whatever the broker tells him.
eat crow
To be forced to accept a humiliating defeat.
eat (one's) heart out
1. To feel bitter anguish or grief.
2. To be consumed by jealousy.
eat (one's) words
To retract something that one has said.
eat out of (someone's) hand
To be manipulated or dominated by another.
eat (someone) alive Slang
To overwhelm or defeat thoroughly: an inexperienced manager who was eaten alive in a competitive corporate environment.

[Middle English eten, from Old English etan; see ed- in the Appendix of Indo-European roots.]

eater n.

Synonyms: eat, consume, devour, ingest
These verbs mean to take food into the body by the mouth: ate a hearty dinner; greedily consumed the sandwich; hyenas devouring their prey; whales ingesting krill.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.