To let a secret out in the open.
To allow something that is hidden to be revealed.
Share a secret that wasn't intended to be shared.
I have let the cat out of the bag, I can't keep a secret about Mary's bad adiction.
My colleagues did not let the cat out of the bag about the new job until I received phone call from the boss.
She let the cat out of the bag and finally told her parents about her plans to immigrate to Australia.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.