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Sentry

usgb/ˈsentri/Volume
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Military ContextPlay
Often used in military or security settings to describe someone on duty for observing and reporting. SlideDuring the exercise, two cadets were assigned as sentries to monitor the perimeter.
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Vigilance RequiredPlay
Implies a need for alertness and constant attention to the surroundings for possible threats. SlideThe role of the sentry is crucial; they must remain vigilant throughout their watch.
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Not Just MilitaryPlay
Can also refer to anyone assigned to keep watch in non-military contexts, like a guard at a museum. SlideThe museum's sentry kept a keen eye on visitors to prevent any art theft.