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3.09
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sentry noun [ ˈsɛntri ]

• a soldier stationed to keep guard or to control access to a place.
• "sentries patrolled the border"
Similar: guard, sentinel, lookout, watch, watchman, patrol, picket, vedette,
Origin: early 17th century: perhaps from obsolete centrinel, variant of sentinel.

stand sentry

• keep guard or control access to a place.

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