n. 禁卫军；护卫队；守卫；后卫（guard的复数形式）

n a person who keeps watch over something or someone

n the person who plays that position on a football team

n a device designed to prevent injury or accidents

n a posture of defence in boxing or fencing

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.

n the duty of serving as a sentry

n (American football) a position on the line of scrimmage

n a position on a basketball team

v to keep watch over

v watch over or shield from danger or harm; protect

v protect against a challenge or attack

v take precautions in order to avoid some unwanted consequence