A method of verifying the accuracy of information by comparing it with other sources. The accountant performed a cross-check of the financial statements to ensure there were no discrepancies.
In ice hockey, an illegal move where a player uses the shaft of the stick to hit an opponent. The referee called a penalty for cross-check after the player aggressively hit his opponent with his stick.
In chess, a tactical reply to a check in which the player gives a check in return, often neutralizing the original threat. Faced with an apparent mating attack, she found a clever cross-check that forced a draw by perpetual check.