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
He darted forward, through the shadows, onto the bare knoll at the top of the ridge, where large boulders stood like sentinels, guarding the mountains.
From "The Girl Who Drank the Moon" by Kelly Barnhill
