google, nfl network

In the game of American football, an offensive lineman is a player who is primarily responsible for blocking.

In football (American), clipping is a type of hit.

It refers to blocking the opposing player from behind at leg level and is an illegal block.

Zone blocking is blocking where the only focus is a hole for the ballcarrier. They block whoever is in their path. Compare that to man blocking, in which blockers are given assignments before the play starts. Linemen in a zone blocking scheme are generally smaller, needing to react and change directions faster.

Passblock and runblock