A cat has nine lives

To land on one's feet

To let the cat out of the bag

Cat got your tongue?

To look like the cat that swallowed the canary

To look like the cat that got the cream

Curiosity killed the cat

Fight like cat and dog

While the cat's away, the mice will play

Like a cat on a hot tin roof

A cat-and-mouse game

Fat cat

A cat may look at a king

Copycat

Look what the cat dragged in

To rain cats and dogs

Scaredy-cat

Cool cat

Alley cat