"to vomit, eject the contents of the stomach," 1600, probably of imitative origin (compare German spucken "to spit," Latin spuere; also see spew (v.)). First attested in the "Seven Ages of Man" speech in Shakespeare's "As You Like It." Related: Puked; puking.
late 14c., "act of expelling contents of the stomach through the mouth," from Anglo-French vomit, Old French vomite, from Latin vomitus, from vomitare "to vomit often," frequentative of vomere "to puke, spew forth, discharge," from PIE root *weme- "to spit, vomit" (source also of Greek emein "to vomit," emetikos "provoking sickness;" Sanskrit vamati "he vomits;" Avestan vam- "to spit;" Lithuanian vemti "to vomit," Old Norse væma "seasickness"). In reference to the matter so ejected, it is attested from late 14c.