From WordNet (r) 3.0 (2006):
upchuck
v 1: eject the contents of the stomach through the mouth; "After
drinking too much, the students vomited"; "He purged
continuously"; "The patient regurgitated the food we gave
him last night" [syn: vomit, vomit up, purge, cast,
sick, cat, be sick, disgorge, regorge, retch,
puke, barf, spew, spue, chuck, upchuck, honk,
regurgitate, throw up] [ant: keep down]