guard
noun.
a person who keeps watch over something or someone
noun.
the person who plays that position on a football team
the left guard was injured on the play
noun.
a device designed to prevent injury or accidents
noun.
a posture of defence in boxing or fencing
keep your guard up
noun.
the person who plays the position of guard on a basketball team
noun.
a military unit serving to protect some place or person
noun.
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
noun.
the duty of serving as a sentry
he was on guard that night
noun.
(American football) a position on the line of scrimmage
guards must be good blockers
noun.
a position on a basketball team
verb.
to keep watch over
there would be men guarding the horses
verb.
watch over or shield from danger or harm; protect
guard my possessions while I'm away
Synonym: ward
verb.
protect against a challenge or attack
Hold that position behind the trees!|Hold the bridge against the enemy's attacks
Synonym: defend, hold
verb.
take precautions in order to avoid some unwanted consequence
guard against becoming too friendly with the staff|guard against infection