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used in a sentence
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Definition a person who stands guard or looks out for something

Much more rarely, sentinel can be used as a verb meaning to stand guard, or provide or post a guard; or to look out for something.

As a proper noun, Sentinel is sometimes used in the name of a newspaper to indicate that the newspaper is looking out for news the public would want.
  • A sentinel watched our approach.
sentinel = person who stands guard or looks out for something
  • She stood sentinel outside.
  • The cell is like an immunological sentinel that looks out for dangerous pathogens.
  • And the leader posted armed sentinels at the fringes of the group.
    Paulo Coelho  --  The Alchemist
  • sentinels = people who stand guard
  • Sometimes the cart would be a tank, as he passed cautiously through rows of armed cling peaches and silent sentinels that looked like boxes of Frosted Flakes.
    Sharon M. Draper  --  Forged by Fire
  • sentinels = a person who stands guard or looks out for something
  • Trumpkin and the two boys arrived at the dark little stone archway which led into the inside of the Mound, and two sentinel badgers (the white patches on their cheeks were all Edmund could see of them) leaped up with bared teeth and asked them in snarling voices, "Who goes there?"
    C.S. Lewis  --  Prince Caspian: The Return to Narnia
  • sentinel = standing guard
  • The Sentinel, owned and edited by Horatio Duckett, came out on Tuesdays.
    Eudora Welty  --  The Collected Stories of Eudora Welty
  • That dreadful sentinel sent a chill to my heart which I do not think that any burglar could have done.
    Arthur Conan Doyle  --  The Adventures of Sherlock Holmes
  • The appearance was full upon us that I had already had to deal with here: Peter Quint had come into view like a sentinel before a prison.
    Henry James  --  The Turn of the Screw
  • One will be a sentinel over the other.
    Alexander Hamilton, James Madison, & John Jay  --  The Federalist Papers — Modern English Edition 2
  • Sentinels with bayonets stood on the landings of the fire-stairways.
    Ayn Rand  --  Atlas Shrugged
  • Good Norfolk, hie thee to thy charge; Use careful watch, choose trusty sentinels.
    William Shakespeare  --  The Life and Death of King Richard III
  • How did you get so far past our sentinels?" they asked one after another.
    J.R.R. Tolkien  --  The Hobbit
  • My boys went out with flashlights and shotguns to clear our path; they were always on sentinel duty when we baptized someone at night.
    Phil Robertson  --  Happy, Happy, Happy: My Life and Legacy as the Duck Commander
  • You cannot cross the rivers again, and behind you there are now secret sentinels that you cannot pass.
    J.R.R. Tolkien  --  The Fellowship of the Ring
  • More tranquil and less fearful than their northern relatives, they posted no sentinels on guard duty at the approaches to their campsite.
    Jules Verne  --  Twenty Thousand Leagues Under the Sea
  • Dawson remained frozen as her figure receded, winding through the sentinel gravestones until she eventually vanished from sight.
    Nicholas Sparks  --  The Best of Me
  • And so two of Rawdon's out-sentinels were in the hands of the enemy.
    William Makepeace Thackeray  --  Vanity Fair
  • I dare not quit my post, though an unfaithful sentinel, whose sure reward is death and dishonour, when his dreary watch shall come to an end!
    Nathaniel Hawthorne  --  The Scarlet Letter
  • [Sentinels at their Post.
    William Shakespeare  --  Antony and Cleopatra

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