Etymology
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forget (v.)

Old English forgietan "lose the power of recalling to the mind; fail to remember; neglect inadvertently," from for-, used here probably with privative force, "away, amiss, opposite" + gietan "to grasp" (see get (v.)). To "un-get," hence "to lose" from the mind. A common Germanic construction (compare Old Saxon fargetan, Old Frisian forjeta, Dutch vergeten, Old High German firgezzan, German vergessen "to forget"). The physical sense would be "to lose (one's) grip on," but that is not recorded in any historical Germanic language. Figurative sense of "lose care for" is from late 13c. Related: Forgetting; forgot; forgotten.

updated on February 17, 2018

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Definitions of forget from WordNet

forget (v.)
dismiss from the mind; stop remembering;
Synonyms: bury
forget (v.)
be unable to remember;
Synonyms: block / blank out / draw a blank
forget (v.)
forget to do something;
Don't forget to call the chairman of the board to the meeting!
forget (v.)
leave behind unintentionally;
I forgot my umbrella in the restaurant
Synonyms: leave
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.