let the cat out of the bag
idiomPart ofbag
let the cat out of the bag — idiom
1. to tell people about something that was meant to be a secret, often by mistake.
1.idiom
Definition
to tell people about something that was meant to be a secret, often by mistake.
Example
Rohan let the cat out of the bag about the surprise party.
Don't let the cat out of the bag — the engagement is still a secret.