Idiom of the day : (21 Nov 2017)


✔ let the cat out of the bag

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■ Meaning:

If you let the cat out of the bag, you let someone know a secret.

■ For example:

  • We’d planned a surprise party for Donna, but some guy she works with let the cat out of the bag, so now she knows.
  • Don’t forget that this is a secret, so whatever you do, don’t let the cat out of the bag.

Origin: Possibly related to the fact that in England in the Middle Ages, piglets were usually sold in bags at markets. Sometimes, someone would try to cheat a buyer by putting a cat in one of the bags instead of a piglet. And if someone let the cat out of the bag, the fraudster’s secret was revealed.