To throw up is to be sick, with food coming back up. Going to throw up, threw up twice, feel like I might throw up.
It also means to produce or reveal, as an inquiry can throw up unexpected findings, which is a quite separate use. The sick sense is a shortening of an older phrase about throwing up your accounts.
1phrasethrow upTo be sick — food coming back up.
“I felt so seasick on the ferry that I thought I would throw up.”
throw up is a vomiting.
Also accepted in games: vomit
A shortening of the older throw up one's accounts, an eighteenth-century phrase for vomiting.
The vomit sense is a a clipping of throw up one's accounts (18th century), from earlier idiom cast up one's accounts (15th century).
Etymology from Wiktionary, CC BY-SA
Practised in Phrasal Verbs