One, such as an inspector or examiner, that checks. One that receives items for temporary safekeeping or for shipment: a baggage checker. A game played on a checkerboard by two players, each using 12 pieces. One of the round flat pieces used in this game. A pattern of checks or squares. One of the squares in such a pattern. A cashier. To mark with a checked or squared pattern. To diversify (something) in color, shading, or character; variegate.