let the cat out of the bag

Cultural  

1. To disclose a secret: “The mayor's visit was to be kept strictly confidential, but someone must have let the cat out of the bag, because the airport was swarming with reporters.”

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let the cat out of the bag Idioms  

1. Give away a secret, as in Mom let the cat out of the bag and told us Karen was engaged. This expression alludes to the dishonest practice of a merchant substituting a worthless cat for a valuable pig, which is discovered only when the buyer gets home and opens the bag. [Mid-1700s] Also see pig in a poke.

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Example Sentences

Peak says Banksy's anonymity "let's him keep doing the campaigning stuff he does unfettered" which, along with loyalty, probably stops the few in the know from letting the cat out of the bag.

From BBC

Now that the movie is in theaters — spoiler alert — we can finally let the cat out of the bag.

From Seattle Times

The 2010 census let the cat out of the bag that Seattle has more pets than children.

From Seattle Times

One recent post of a cat inside a traveler’s clear plastic backpack featured the caption, “We let the cat out of the bag … on our Top 10 Catches of 2021!”

From Seattle Times

Ultimately, McCartney was the first to “let the cat out of the bag” by going solo — “because I was fed up of hiding it” — and therefore incurred the majority of the blame.

From Los Angeles Times

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