In ice hockey, an offside is called when any member of the attacking team crosses the opponent's blue line into the offensive zone before the puck. Both of the player's skates must be over the line for the play to be offside.
In an offside call, play is stopped, and the teams face off in the neutral zone on the side closest to where the offside occurred. When a delayed offside is called, play continues until a member of the attacking team touches the puck, then it is stopped for a neutral-zone faceoff. Delayed offside occurs when the defending team is able to clear the puck out of its zone without delay or contact with an offensive player. It also occurs if the attacking players leave the zone when the puck crosses the line.