Sentinel



noun
1.
a person or thing that watches or stands as if watching.
2.
a soldier stationed as a guard to challenge all comers and prevent a surprise attack:
to stand sentinel.
3.
Digital Technology. tag1 (def 9a).
verb (used with object), sentineled, sentineling or (especially British) sentinelled, sentinelling.
4.
to watch over or guard as a sentinel.
noun
1.
a person, such as a sentry, assigned to keep guard
2.
(computing) a character used to indicate the beginning or end of a particular block of information
verb (transitive) -nels, -nelling, -nelled
3.
to guard as a sentinel
4.
to post as a sentinel
5.
to provide with a sentinel

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