a person or thing that verifies or examines something.
a spelling checker
a cashier in a supermarket.
At a recent trip to the supermarket the checker accidentally failed to me charge for some items.
a pattern of squares, typically alternately colored.
a geometric shape bordered by checkers
a game for two players, with twelve pieces each, played on a checkerboard.
They also played board games like checkers , chess, and dominoes.