dog and cat

bell the cat

To undertake a dangerous action in the service of a group.

buy a dog and bark oneself

To do something that one has hired someone else to do.

cat and dog life

An unhappy married life marked by arguments and disagreements.

cat got someone's tongue

Why is someone not saying anything?

cat in the meal-tub

Something concealed; a hidden danger.

cat piss

Any beverage of low quality.

cat that ate the canary

A person who appears self-satisfied or smug, especially while concealing something mischievous, prohibited, or private.

cool cat

A person who performs or appreciates jazz, especially one whose style of speech and movement is relaxed and rhythmic.