adjective
Definition: Referring to a type of block in football where a player, usually positioned on the outside, moves back towards the center to block an opponent after the ball is snapped.
Example: The team executed a crackback block to protect their quarterback during the play.
noun
Definition: A type of block in football where a player unexpectedly hits a defender from the side or behind, usually to help a teammate advance the ball.
Example: The wide receiver executed a perfect crackback to protect the quarterback.