Definition of sentry noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈsentri//
; NAmE NAmE//ˈsentri//
(pl. sentries) The army
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a soldier whose job is to guard something to be on sentry duty People approaching the gate were challenged by the sentry. Everyone took their turn at sentry duty. See related entries: The army Word Originearly 17th cent.: perhaps from obsolete centrinel, variant of sentinel.
See the Oxford Advanced American Dictionary entry: sentry

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