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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.
verb (used with object), sent, sending. 1. to cause, permit, or enable to go: to send a messenger; They sent their son to college. 2. to cause to be conveyed or transmitted to a destination: to send a letter.