일제히

iljehi [일쩨히]

일제히 + 일어나다/박수를 치다/시작하다

all at once, simultaneously, in unison

Example

공연이 끝나자 관객들이 일제히 박수를 쳤어요.

When the show ended, the audience applauded all at once.

Word parts

일 one제 even, uniform

Literally 'evened out as one' — everyone at the same moment.