crosscheck noun 3verb 3forms 3 noun3 •A verification (of information, data, or calculations) by using an alternative source or method. •An illegal maneuver where a player strikes another with the shaft of his stick, or the penalty thereby incurred. •A penalty where a player hits another player with the shaft of their lacrosse stick with their hands spread apart. verb3 •To verify (information, data, or calculations) by using an alternative source or method. •To commit the infraction of checking an opponent by using the shaft of one's stick with both hands. •To hit another player with the shaft of a lacrosse stick.He picked up a roughing penalty for crosschecking Montreal’s Andrei Kostitsyn to the ice Tuesday after Kostitsyn hit Boston defenseman Aaron Ward from behind. — 2009 formscrosschecked · crosschecking · crosschecks