Synonyms for guard

noun

• a device designed to prevent injury or accidents
• the duty of serving as a sentry
• a precautionary measure warding off impending danger or damage or injury etc.
• (American football) a position on the line of scrimmage
• a military unit serving to protect some place or person
• a person who keeps watch over something or someone
• a position on a basketball team
• a posture of defence in boxing or fencing
• the person who plays that position on a football team
• the person who plays the position of guard on a basketball team

verb

• watch over or shield from danger or harm; protect
• protect against a challenge or attack
• take precautions in order to avoid some unwanted consequence
• to keep watch over