Idiom: let the cat out of the bag
— I’m getting your father new golf clubs for his birthday but please don’t let the cat out of the bag.
— Never, ever tell Martha anything personal—she always let's the cat out of the bag.
— Sandy didn't look surprised at all. Somebody must have let the cat out of the bag about her surprise birthday party.
— I accidentally let the cat out of the bag about your engagement and mom's furious you told me about it first.
— Promise you won't let the cat out of the bag—I'm getting promoted to district manager and everybody's going to be upset about it.
— Why are you giving me $500? Someone must have let the cat out of the bag that I got fired from my job.
— Oops! I didn't mean to let the cat out of the bag about your cancer diagnosis. I'm terribly sorry.
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