S: (n) guard (a posture of defence in boxing or fencing) "keep your guard up"
S: (n) guard (the person who plays the position of guard on a basketball team)
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: (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) protect (shield from danger, injury, destruction, or damage) "Weatherbeater protects your roof from the rain"
S: (v) defend (be on the defensive; act against an attack)
S: (v) prevent, keep (stop (someone or something) from doing something or being in a certain state) "We must prevent the cancer from spreading"; "His snoring kept me from falling asleep"; "Keep the child from eating the marbles"
S: (v) guard (take precautions in order to avoid some unwanted consequence) "guard against becoming too friendly with the staff"; "guard against infection"