A check-raise is made when a player checks on the first opportunity to bet and later raises any subsequent bet in the same betting round.

To check and then raise when a player behind you bets. Occasionally you will hear people say this is not fair or ethical poker. Piffle. Almost all casinos permit check-raising, and it is an important [..]

A classic move. You check, hoping to draw others in to bet. When they do, you raise.

Initially checking in a Betting Round and then Raising a Bet that is subsequently made

when you check, someone else bets behind you, and then you raise when the action gets back to you. "I checkraised him on the flop with my top pair."

To check and then raise an opponent's bet.