Etymology
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upchuck (v.)

"to vomit," 1936, American English slang, from up (adv.) + chuck (v.) "to throw."

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Definitions of upchuck

upchuck (v.)
eject the contents of the stomach through the mouth;
Synonyms: vomit / vomit up / purge / cast / sick / cat / be sick / disgorge / regorge / retch / puke / barf / spew / spue / chuck / honk / regurgitate / throw up
From wordnet.princeton.edu