guard
//ɡɑːrd//
Noun
A person who keeps watch over or protects a place, person, or thing
The guard stood at the entrance to the building.
A state of vigilance or watchfulness to protect against danger or attack
The soldiers kept guard throughout the night.
A protective device or part that prevents injury or damage
The machine has a safety guard to protect workers from moving parts.
A defensive player in basketball or a position in American football
He plays guard on the basketball team.
Verb
To watch over and protect someone or something from harm or danger
Soldiers guard the palace day and night.
To keep watch at a place to prevent escape or entry
Soldiers guarded the entrance to the building.
To protect or defend against attack or criticism
She guarded her reputation carefully against any criticism.