expression, godan verb (-ru)
laughter breaks out
Describes a situation where laughter spontaneously arises among a group, often in response to something funny or unexpected.
彼の冗談で会場に笑いが起こった。
His joke caused laughter to break out in the venue.
Compound of 笑い (laughter) + が (subject marker) + 起こる (to occur, to break out).