guard The word "guard" means to protect or keep safe. In these examples, "guard" is a verb: - A large dog guards the house across the street.
- How many people guard the border between China and India?
- My neighbor uses cameras, motion detectors, alarms, and several guns to guard his house.
- Computer security experts recommend that you guard your computer with anti-virus software.
- He’s guarding the entrance to the castle.
 He’s a castle guard.
The adjective form for this word is "guarded." - Following a breach in security, the area remains guarded.
- A guarded convoy of cars and SUVs drove through the center of the city.
The word "guard" is also a noun that refers to a person who provides security. - There are several guards inside the bank.
- A security guard approached the visitors to the building.
- A lifeguard at a beach or a swimming pool helps save people from harming themselves as they are swimming.
- A bodyguard is hired to protect rich and famous people from abduction or from overzealous fans.
- A large dog can be a good guard for your home.
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He’s a castle guard.