| Noun | 1. | linebacker - a defensive football player who takes a position close behind the linemenfootball player, footballer - an athlete who plays American football |
| 2. | linebacker - (American football) the position of a defensive football player who plays close behind the line of scrimmage back - (American football) the position of a player on a football team who is stationed behind the line of scrimmage football team, eleven - a team that plays football |