B2[I or T]to break open or apart suddenly, or to make something do this: I hate it when balloons burst.Suddenly the door burst open(= opened suddenly and forcefully) and police officers rushed in.The river was threatening to burst its banks.figurativehumorousIf I eat any more cake I'll burst (= I cannot eat anything else)!Exploding and eruptingC2[I]to feel a strong emotion, or strong wish to do something: I knew they were bursting with curiosity but I said nothing.[+ to infinitive]informalI'm bursting to go to the loo!Tom was bursting to tell everyone the news.Strong feelingsburst into flamesC2to suddenly burn strongly, producing a lot of flames: Smoke started pouring out from underneath, then the truck burst into flames.Burning, burnt and on fire