(n): a person who cares for persons or property
(n): the person who plays that position on a football team
(n): one of the players on the line of scrimmage
(n): a device designed to prevent injury or accidents
(n): an instrumentality invented for a particular purpose
(n): a posture of defence in boxing or fencing
(n): the arrangement of the body and its limbs
(n): the person who plays the position of guard on a basketball team
(n): an athlete who plays basketball
(n): a military unit serving to protect some place or person
(n): a unit that is part of some military service
(n): a precautionary measure warding off impending danger or damage or injury etc.
(n): any maneuver made as part of progress toward a goal
(n): the duty of serving as a sentry
(n): a duty that you are assigned to perform (especially in the armed forces)
(n): (American football) a position on the line of scrimmage
(n): (American football) the position of a player on a football team who is stationed on the line of scrimmage
(n): a position on a basketball team
(n): (in team sports) the role assigned to an individual player
(v): to keep watch over
(v): follow with the eyes or the mind
(v): watch over or shield from danger or harm; protect
(v): shield from danger, injury, destruction, or damage
(v): protect against a challenge or attack
(v): shield from danger, injury, destruction, or damage
(v): take precautions in order to avoid some unwanted consequence
(v): perform an action, or work out or perform (an action)
In fencing, the guard or bell guard protects the hand from the opponent's blade.