Dictionary Home » The American Heritage Dictionary of Idioms » when the cat's away, the mice will play

when the cat's away, the mice will play

when the cat's away, the mice will play idiom
Without supervision, people will do as they please, especially in disregarding or breaking rules. For example, As soon as their parents left, the children invited all their friends over—when the cat's away, you know. This expression has been a proverb since about 1600 and is so well known it is often shortened, as in the example.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.