Countercheck

[kauntәtʃek]

(noun.) something that checks the correctness of a previous check.

(noun.) a check that restrains another check.

(verb.) check a second time.

(verb.) oppose or check by a counteraction.

Edited by Eileen--From WordNet

(v. t.) To oppose or check by some obstacle; to check by a return check.

(n.) A check; a stop; a rebuke, or censure to check a reprover.

(n.) Any force or device designed to restrain another restraining force; a check upon a check.

Checker: Marsha