retch

nouns

an involuntary spasm of ineffectual vomiting
"a bad case of the heaves"
heave, retch

verbs

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"
barf, be sick, cast, cat, chuck, disgorge, honk, puke, purge, regorge, regurgitate, retch, sick, spew, spue, throw up, upchuck, vomit, vomit up
make an unsuccessful effort to vomit; strain to vomit
gag, heave, retch