He let the cat out of the bag about the party.
let the cat out of the bag
idiom B1
To disclose a secret; to let a secret be known, often inadvertently.
Origin
first recorded 18th c.First recorded in The London Magazine (1760); traditionally linked to market fraud — selling a cat in a sack as a 'pig in a poke' — though that story is unverified.
We wanted it to be a surprise, but someone let the cat out of the bag.
The firm planned to announce the merger next month, but a careless email let the cat out of the bag and shares tumbled.
- 01
bag of bones
A skinny, malnourished person or animal.
- 02
bag of tricks
A set of skills, techniques, items of information, or other resources used to help achieve professional or personal goals.
- 03
bell the cat
To undertake a dangerous action in the service of a group.
- 04
brown bag
A short presentation or seminar on a given subject, especially one given at lunchtime.
- 05
buy to let
To purchase a property as in investment, and to let it out for rental instead of living in it
- 06
cat and dog life
An unhappy married life marked by arguments and disagreements.
- 07
cat got someone's tongue
Why is someone not saying anything?
- 08
cat in the meal-tub
Something concealed; a hidden danger.