let the cat out of the bag

let the cat out of the bag

/ˌlet ðə ˌkæt aʊt əv ðə ˈbæɡ/

💬 Idioms & Expressions

to reveal a secret accidentally

let the cat out of the bag in a sentence

She let the cat out of the bag about the surprise party.

Origin of let the cat out of the bag

Possibly from fraudulent market practice of substituting cat for piglet in bag