all at once
成語所屬單字once
all at once — 慣用語
1. in a sudden way, with everything changing in the same moment.
1.慣用語
釋義
突然；一下子
in a sudden way, with everything changing in the same moment.
例句
All at once, the market lights went out and everyone stopped talking.
Mina was calm, then all at once she burst into tears.