A case of mistaken identity

An incorrect identification of someone. It was a case of mistaken identity when the police arrested the wrong person.

Cash-and-carry

A system where you pay cash for some goods and then carry or take them away. The supermarkets in our city operate on a cash-and-carry basis.

Cast around for (someone or something)

To look for someone or something. We are casting around for a new secretary in our company.

A case in point

An example that proves something or helps to make something clear. What our boss said is a case in point about what I have also been saying.

Carry a tune

To be able to sing accurately, to have musical ability. The girl in the music class cannot carry a tune.

Cast a vote

To vote for something. I cast a vote in the election for a new class president.

Cast about for (someone or something)

To look for someone or something. The man has been casting about for a new job for a long time.

Cash on the barrelhead

To pay cash to buy something. We were forced to pay cash on the barrelhead for everything at the store.

Cash in on (something)

To make a lot of money at something. The small city cashed in on their success after the winter Olympics.

Cash in (something) or cash (something) in

To exchange something for money. We will cash in the coupons because we need some money.