linebacking


line·back·er

L0181800 (līn′băk′ər)n. Abbr. LB Football Any of the defensive players forming a second line of defense behind the players on the line of scrimmage.
line′back′ing n.

linebacking

(ˈlaɪnˌbækɪŋ) nthe act of forming a second line of defence, close to the linesman