English dictionary
sentinel
/'s/E/n,t/-/n/-/l/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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a person employed to keep watch for some anticipated event
Source: WordNet 3.0
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One who watches or guards; specifically <i>(Mil.)</i>, a soldier set to guard an army, camp, or other place, from surprise, to observe the approach of danger, and give notice of it; a sentry.
Source: webster1913
verb
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To watch over like a sentinel.
Source: webster1913