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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.
General Orders for Sentries. Orders to Sentry is the official title of a set of rules governing sentry (guard or watch) duty in the United States Armed Forces.