when the cat’s away, the mice will play

idiomPart ofcat

when the cat’s away, the mice will play — idiom

1. People misbehave or enjoy themselves when the authority figure is absent.

1.idiom
Definition

People misbehave or enjoy themselves when the authority figure is absent.

Example

When the boss left, the staff relaxed; when the cat's away, the mice will play.

The kids threw a party because when the cat's away, the mice will play.