Definition of Sentinel

one whose job is to keep watch and protect

Examples of Sentinel in a sentence

The armed sentinel stood outside of the meeting room to make sure no one interrupted the two world leaders.  🔊

At my house, my German Shepherd is the sentinel who keeps anyone from coming inside without permission.  🔊

Sentinel is the name of the government’s drone program that helps to monitor the airspace over our country.  🔊

When the police arrived on the scene, they had to contend with the dog who was acting as a sentinel over its owner’s dead body.  🔊

In the movie, the job of the sentinel was to protect the humans by killing the mutants.  🔊

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