guard

(n) a person who keeps watch over something or someone
(n) the person who plays that position on a football team
- the left guard was injured on the play
(n) a device designed to prevent injury or accidents safety device, safety,
(n) a posture of defence in boxing or fencing
- keep your guard up
(n) the person who plays the position of guard on a basketball team
(n) a military unit serving to protect some place or person
(n) 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
precaution, safeguard,
(n) the duty of serving as a sentry
- he was on guard that night
guard duty, sentry duty, sentry go,
(n) (American football) a position on the line of scrimmage
- guards must be good blockers
(n) a position on a basketball team

(v) to keep watch over
- there would be men guarding the horses
(v) watch over or shield from danger or harm; protect
- guard my possessions while I'm away
ward,
(v) protect against a challenge or attack
- Hold that position behind the trees!
- Hold the bridge against the enemy's attacks
defend, hold,
(v) take precautions in order to avoid some unwanted consequence
- guard against becoming too friendly with the staff
- guard against infection

ward defend hold safety device safety precaution safeguard guard duty sentry duty sentry go

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guardant guard boat guard dog guard duty guarded guardedly guard hair guardhouse guardian guardian angel guardianship guardian spirit guard of honor guardrail guardroom guard ship guardsman guard's van