Football

5. Failure to make a new first down on the final (4th) down
8. an offensive player in the backfield.
9. to seize, stop, or throw down (a ball-carrier).
11. a player on defense who takes a position close behind the linemen
12. the player who passes (or "snaps") the ball between his legs to the quarterback at the start of each play.
13. a disadvantage or handicap imposed on a player or team, typically for infringement of rules.
14. to tackle (the quarterback) behind the line of scrimmage before the quarterback is able to throw a pass.

1. a defensive back positioned to the outside of the linebackers.
2. the final down a team has to reach the ten yard goal set out for each set of downs.
3. the practice or art of defending oneself or one's goal against attack, as in fencing, boxing, soccer, or football.
4. to fail to hold or maintain hold on (a ball) after having touched it or carried it.
6. the side which is in possession of the ball.
7. a player positioned behind the center who directs a team's offensive play.
10. a kick in which the ball is dropped and then kicked before it touches the ground.
13. interference a foul that occurs when a player interferes with an eligible receiver's ability to make a fair attempt to catch a forward pass