NFL
Reading between the lines of offensive terminology

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Crack-back block: When an offensive player going downfield turns back to the middle to block a player from the side.

Drive block: The offensive lineman fires out low and hard on the defender, hitting him squarely between the numbers and moving him out of a specified area.

Clipping: Blocking an opponent below the waist from behind. The penalty is 15 yards.

Reach block: The offensive lineman reaches to hit a player in front of another lineman, rather than the one directly in front of him. This tactic is usually used on running plays.

Seal block: When a blocker tries to seal off the defensive pursuit from one side of the field.

Opening up holes: To create running lanes for the ballcarrier by blocking defenders to either side of the desired "hole."

Off-tackle play: A running play designed to go to the tight end's side, taking advantage of the hole created by the tackle, tight end and, in some cases, the fullback.