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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.
Sentry/Watchman. The Sentry brings the news that Polyneices has been buried, and later captures Antigone. His speech is an interesting experiment in the history of Greek drama, as it attempts to approximate the rhythms and diction of natural speech.