Expressions with "cat"

Anybody who knows me knows I love cats, so I thought I'd put in a few expressions using the word "cat".

Cat got your tongue? - Used when someone is uncharacteristically or unexpectedly silent.

S/he thinks s/he's the cat’s whiskers/meow/pajamas - S/he thinks s/he is great, fantasic, the bee's knees.

Look what the cat’s brought/dragged in! - Used when somebody appears unexpectedly, not necessarily looking their best.

There’s no/not enough room to swing a cat. - The place is very crowded/full.

They fight like cat and dog. - They have a terrible relationship and argue a lot.

grin like a Cheshire cat - smile a very big smile (The Cheshire cat is a character in Alice in Wonderland.)

let the cat out of the bag - give away a secret (usually unintentionally)
The cat's out of the bag. - the secret is out/has been discovered

It's raining cats and dogs! - It's raining very hard.

Curiosity killed the cat. - "Be careful! Don't go looking where you don't belong!"

When the cat's away (the mice will play). - When an authority figure (boss, parent, etc.) is absent, the employees/children, etc. will do whatever they want to.

Catstuff has lots more expressions.