sentinel
//ˈsɛntɪnəl//
Noun
sentinelSingular
sentinelsPlural
1
A soldier or guard whose job is to stand and keep watch.
The sentinel stood at the gate throughout the night.
2
A person or thing that watches over or protects something.
The old lighthouse stands as a sentinel over the harbor.
Verb
sentinelsPresent tense
sentineledPast tense
sentineledPast participle
sentinelingPresent participle
sentinelsThird-person singular
1
To watch over or guard as a sentinel.
The loyal dog sentineled the house while the family was away.