to allow a secret to be known, usually without intending to: I was trying to keep the party a secret, but Mel went and let the cat out of the bag.
What is an example of cat out of the bag?
'Let the cat out of the bag' means accidentally revealing information that you weren't supposed to reveal. Example of use: “Tim let the cat out of the bag about my surprise birthday party.”
What does cats in a bag mean?
a bad-tempered person.