guard in WordNet English dictionary

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

1. a position on a basketball team
   guard 
   
2. the duty of serving as a sentry
   "he was on guard that night"
   guard duty  guard  sentry duty  sentry go 
   
3. (American football) a position on the line of scrimmage
   "guards must be good blockers"
   guard 
   
4. 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  guard 
   
5. a device designed to prevent injury or accidents
   guard  safety  safety device 
   
6. a posture of defence in boxing or fencing
   "keep your guard up"
   guard 
   
7. a military unit serving to protect some place or person
   guard 
   
8. the person who plays that position on a football team
   "the left guard was injured on the play"
   guard 
   
9. a person who keeps watch over something or someone
   guard 
   
10. the person who plays the position of guard on a basketball team
    guard