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sentry (plural sentries) 1  A guard, particularly on duty at the entrance to a military base. ( 2 uncountable) Sentry duty; time spent being a sentry. ( 3 nautical) A form of drag to be towed underwater, which on striking bottom is upset and rises to the surface.
Examples of sentry in a sentence. 1  The general placed an armed sentry at the bridge. 2  a sentry posted to watch for intruders.