guard (Noun) — A person who keeps watch over something or someone.
guard (Noun) — The person who plays that position on a football team. ex. "the left guard was injured on the play"
guard (Noun) — A device designed to prevent injury or accidents.
guard (Noun) — A posture of defence in boxing or fencing. ex. "keep your guard up"
guard (Noun) — The person who plays the position of guard on a basketball team.
guard (Noun) — A military unit serving to protect some place or person.
guard (Noun) — A precautionary measure warding off impending danger, damage or injury etc.. ex. "we let our guard down"
guard (Noun) — The duty of serving as a sentry. ex. "he was on guard that night"
guard (Noun) — (American football) a position on the line of scrimmage. ex. "guards must be good blockers"
guard (Noun) — A position on a basketball team.
guard (Verb) — To keep watch over. ex. "there would be men guarding the horses"
guard (Verb) — Watch over or shield from danger or harm; protect. ex. "guard my possessions while I'm away"
guard (Verb) — Protect against a challenge or attack. ex. "guard that position behind the trees!"
guard (Verb) — Take precautions in order to avoid some unwanted consequence. ex. "guard against becoming too friendly with the staff" ex. "guard against infection"