In American football, a trap play, or trap run, is a run consisting of a defender on the line of scrimmage (either a defensive tackle or defensive end) getting trap blocked by an offensive lineman or back from the opposite (other side of the center) side of the ball. The play is known as a "trap" because the strong side offensive lineman will "block down" on a linebacker, seemingly leaving a defensive lineman unblocked.
In American football, a trap play, or trap run, is a run where a defender on the line of scrimmage (either a defensive tackle or defensive end) gets trapped by an offensive lineman or back from the opposite side. The term "trap" refers to the strong-side blocker who "blocks down" on a linebacker, seemingly leaving another defender unblocked.