all of a sudden

idiomPart ofsudden

all of a sudden — idiom

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

1.idiom
Definition

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

Example

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.