guard

Sense 1 noun

a person who keeps watch over something or someone

Sense 2 verb

to keep watch over

there would be men guarding the horses

Sense 3 noun

the person who plays that position on a football team

the left guard was injured on the play

Sense 4 verb

watch over or shield from danger or harm; protect

guard my possessions while I'm away

Sense 5 noun

a device designed to prevent injury or accidents

Sense 6 verb

protect against a challenge or attack

Hold that position behind the trees!

Sense 7 noun

a posture of defence in boxing or fencing

keep your guard up

Sense 8 verb

take precautions in order to avoid some unwanted consequence

guard against becoming too friendly with the staff

Sense 9 noun

the person who plays the position of guard on a basketball team

Sense 10 noun

a military unit serving to protect some place or person

Sense 11 noun

a precautionary measure warding off impending danger or damage or injury etc.

he put an ice pack on the injury as a precaution

Sense 12 noun

the duty of serving as a sentry

he was on guard that night

Sense 13 noun

(American football) a position on the line of scrimmage

guards must be good blockers

Sense 14 noun

a position on a basketball team