A checker in animation is the person who assembles a dry run of a scene that is ready for the camera. The checker needs to go through the scene to detect and correct errors and breaks in continuity before transferring it to film.

Check"er, n. [From Check, v. t.]

One who checks.

© Webster 1913.

Check"er (?), v. t. [imp. & p. p. Checkered (?); p. pr. & vb. n. Checkering.] [From OF. eschequier a chessboard, F. 'echiquier. See Check, n., and cf. 3d Checker.]

1.

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

2.

To variegate or diversify with different qualities, color, scenes, or events; esp., to subject to frequent alternations of prosterity and adversity.

Our minds are, as it were, checkered with truth and falsehood. Addison.

© Webster 1913.

Check"er, n. [OF. eschequier. See Checker, v. t.]

1.

A piece in the game of draughts or checkers.

2.

A pattern in checks; a single check.

3.

Checkerwork.

This word is also written chequer.

© Webster 1913.