let the cat out of the bag
I was going to surprise her with a party, but my brother let the cat out of the bag by mentioning it in front of her.
The speaker accidentally revealed the planned surprise party to the intended recipient.
to reveal a secret or disclose information that was meant to be kept hidden
She didn’t want anyone to know about her pregnancy, but her doctor let the cat out of the bag during a family gathering.
The doctor unintentionally disclosed her pregnancy to others.
The company planned to announce the merger quietly, but a leak let the cat out of the bag weeks early.
A premature disclosure revealed the merger before the official announcement.
Often used when the revelation is accidental or unintended.
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Pro Tip
Avoiding accidental revelations
Use phrases like 'keep it under wraps' or 'don't breathe a word' when you need to emphasize confidentiality. Reserve 'let the cat out of the bag' for situations where a secret has already been revealed.
Gold Rule
Idiom usage
Always use 'let the cat out of the bag' to describe an unintended or accidental revelation of a secret. It is not suitable for planned disclosures.
Word Origin
The phrase dates back to the 18th century and originates from a fraudulent practice where merchants would sell cats disguised as piglets in bags. If the cat escaped, the deception was revealed. The idiom metaphorically extends this idea to any unintended disclosure of a secret.
Usage Notes
This idiom is typically used in informal contexts. It implies that the revelation was not intended or was done carelessly. Avoid using it in formal or professional settings where precision is required.