to let the cat out of the bag
01
to reveal information that were supposed to be kept secret, often by accident
Idiom
Informal
例子
She wanted to buy designer clothes and dine at fancy restaurants, but with her student budget, she had champagne taste on a beer budget.
John dreamt of owning a luxury sports car, but his salary only allowed for a used economy car — he had champagne taste on a beer budget.
