sentinel
noun
a person or thing that watches or stands as if watching.
sentinels
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The birds feed on insects living on rhinos and can also act as sentinels - calling to warn their hosts when danger approaches.
From BBC ● Aug. 25, 2026
“We stand on the walls, sentinels of the inner sanctum, against the assault of AI slop. The Ontology is based firmly in reality—there is, here, a dialectic between ground truth, tribal knowledge, and enhancements.”
From The Wall Street Journal ● May 5, 2026
“We stand on the walls, sentinels of the inner sanctum, against the assault of AI slop,” Karp said in his letter to shareholders.
From Barron's ● May 4, 2026
“The workers, the cats, and the bulk milk samples are the best sentinels for early dairy herd diagnoses,” he said.
From Los Angeles Times ● Feb. 21, 2025
There were more dementors in here, casting their freezing aura over the place; they stood like faceless sentinels in the corners farthest from the high, raised platform.
From "Harry Potter and the Deathly Hallows" by J.K. Rowling
