We've already learned what it means to have possession of the puck in an ice hockey game. Throughout the course of a game, teams are constantly changing ownership of the puck through turnovers. A turnover is a change of possession without a goal in ice hockey.
A cross-check is when a defensive player uses the full length of his hockey stick to shove into an opposing player while he makes contact.
Checking From Behind
A major penalty will be given to any defensive player who cross-checks into a player from behind or while that player is unable to defend himself.