throw up verb 8exclamation 1throw-up noun 1forms 5 verb8 •To cause something such as dust or water to rise into the air.The car wheels threw up a shower of stones. •(informal) To vomit.The baby threw up all over my shirt.That cat is always throwing up hairballs. •To produce or reveal something new or unexpected.This system has thrown up a few problems. •To give up, abandon something.In 1944, believing, as people in Leeds tended to do, that flying bombs or no flying bombs, things were better Down South, Dad threw up his job with the Co-op and we migrated to Guildford. — 2011 •To erect, particularly hastily.Every depression in the ground had been utilized; every rise taken advantage of, to dig rifle-pits or throw up a little earthwork, surrounded with sand-bags […] — 1872 •To display a gang sign using the hands.Why don't you go on and throw up ya gang sign. Represent your hood, homey? — 2005 •(old-fashioned) To enlarge, as a picture reflected on a screen. •(no longer used) To give special prominence to a line or lines. exclamation1 •Used as an expression of frustration or to dismiss a conversation partner."Oh, throw up," thought Rayne. "Don't say they've taken a fancy to each other." — 2011 throw-up noun1 •(slang) Synonym of throwie (“kind of simple graffiti”).There is a hierarchy of sorts: a throw-up can go over a tag, a piece over a throw-up, and a burner over a piece. — 2011 formsthrew up · thrown up · throwing up · throws up · throw-ups