sentry
Definitions
A soldier stationed to keep guard or to control access to a place.
A person or animal that stands watch or keeps guard.
Examples
The sentry stood motionless at the palace gate throughout the night.
A lone sentry was posted at the entrance to guard the secret facility.
The soldiers relieved the sentry after his four-hour shift in the watchtower.
Synonyms
Antonyms
intruder attacker invader aggressor trespasser infiltrator assailant