Phrase
tell information that is not meant to be known
let the cat out of the bag
Don't worry, t won't let the cat out of the bag, but I know why you're so tired. You were up all night with the new guy you met last week!
raining cats and dogs
You're right. It was raining cats and dogs but he shared his umbrella. We walked and talked together for hours. It was so romantic!
the cat's meow
He's what? That is terrible! You may think he's the cat's meow, but stealing is illegal. You can't go out with a person like this even if he's super nice to you.