From Longman Dictionary of Contemporary Englishbust up phrasal verb informal1RELATIONSHIP British English if people bust up, they end their relationship or friendship syn break up 🔊 They bust up after six years of marriage. →bust-up(1)2bust something ↔ upPREVENT to prevent an illegalactivity or bad situation from continuing syn break up 🔊 A couple of teachers stepped in to bust up the fight.3bust something ↔ up American EnglishDAMAGE to damage or break something 🔊 A bunch of bikers busted up the bar.4American English to start laughing a lot syn crack up 🔊 Elaine busted up laughing at the sight of him. →bust→ See Verb table
Examples from the Corpus
bust up• She said Gloria was always trying to bust up their conversations.bust-upˈbust-up noun [countable] informal 🔊 🔊 1RELATIONSHIPthe end of a relationshipbust-up of 🔊 the bust-up of their marriage → bust upat bust12ARGUE British English a very bad quarrel or fight 🔊 Cathy and I had a real bust-up yesterday.