S: (n) guard (a military unit serving to protect some place or person)
S: (n) precaution, safeguard, guard (a precautionary measure warding off impending danger or damage or injury etc.) "he put an ice pack on the injury as a precaution"; "an insurance policy is a good safeguard"; "we let our guard down"
S: (n) lineman ((American football) the position of a player on a football team who is stationed on the line of scrimmage)
S: (n) center ((American football) the position of the player on the line of scrimmage who puts the ball in play) "it is a center's responsibility to get the football to the quarterback"
S: (n) guard ((American football) a position on the line of scrimmage) "guards must be good blockers"
S: (n) tackle ((American football) a position on the line of scrimmage) "it takes a big man to play tackle"
S: (v) guard, ward (watch over or shield from danger or harm; protect) "guard my possessions while I'm away"
S: (v) defend, guard, hold (protect against a challenge or attack) "Hold that position behind the trees!"; "Hold the bridge against the enemy's attacks"
S: (v) guard (take precautions in order to avoid some unwanted consequence) "guard against becoming too friendly with the staff"; "guard against infection"