(1):

(v. t.) One who checks.

(2):

(v. t.) Checkerwork.

(3):

(n.) To variegate or diversify with different qualities, colors, scenes, or events; esp., to subject to frequent alternations of prosperity and adversity.

(4):

(n.) To mark with small squares like a checkerboard, as by crossing stripes of different colors.

(5):

(v. t.) A piece in the game of draughts or checkers.

(6):

(v. t.) A pattern in checks; a single check.