noun

1. a small square, as on a chessboard
2. a pattern of such squares
3. 1. a game played on a checkerboard by two players, each with twelve round, flat pieces to move
   2. any of these pieces
4. service tree

Etymology: ME cheker, chessboard, aphetic < escheker < OFr eschekier < ML scaccarium: see check

transitive verb

1. to mark off in squares, or in patches of color
2. to break the uniformity of, as with varied features or events, changes in fortune, etc.

noun

1. a person who examines or verifies
2. ☆ a person who checks hats, luggage, etc.
3. ☆ a cashier, as in a supermarket