guard

Free Dictionary (English)

guard — noun

1. A person who, or thing that, protects or watches over something.
2. A garda; a police officer.
3. A squad responsible for protecting something.

guard — verb

1. To protect from danger; to secure against surprise, attack, or injury; to keep in safety; to defend.
2. To keep watch over, in order to prevent escape or restrain from acts of violence, or the like.
3. To watch by way of caution or defense; to be caution; to be in a state or position of defense or safety.