ichidan verb, intransitive verb
break down laughing; collapse in laughter
Describes someone laughing so hard they lose physical composure, often slumping or doubling over.
彼の冗談にみんな笑い崩れた。
Everyone broke down laughing at his joke.
あまりにおかしくて、椅子から笑い崩れそうになった。
It was so funny I almost collapsed laughing off my chair.