Definitions for "Perpetual Check"
A situation in which one player is checking his opponent continuously and his opponent is either unable or unwilling to evade the checks. Perpetual Check is not a rule of chess but will eventually lead to a draw by REPETITION.
Unremitting attack on a king, without checkmate. Under some rules this may result in a draw.
A situation where one player can give check to the enemy king indefinitely, resulting in a draw.