some cat idioms

when the cat's away (the mice will play):

used to say that people will not behave well when the person who has authority over them is not there

let the cat out of the bag:

to tell someone a secret, especially without intending to

put/set the cat among the pigeons:

to do or say something that causes arguments, trouble etc

look like something the cat dragged/brought in:

to look very dirty or untidy

like a cat on a hot tin roof:

so nervous or anxious that you cannot keep still or keep your attention on one thing

like the cat that ate the canary:

very proud or pleased because of something you have achieved or got