all of a sudden

成語所屬單字sudden

all of a sudden — 慣用語

1. used when an event takes place so fast and without any warning that those involv

1.慣用語
釋義

突然；冷不防

used when an event takes place so fast and without any warning that those involved are surprised by it

例句

All of a sudden, the sky turned dark and heavy rain started falling on the street.

Roya was reading quietly when all of a sudden the phone rang loudly.