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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.
BUSINESS INSURANCE. Whether your exposures apply to property, general liability, auto, workersâ compensation or other essential coverages, Sentry has the expertise to help you develop an insurance program designed to fit your business's needs.USINESS INSURANCE. Whether your exposures apply to property, general liability, auto, workersâ compensation or other essential coverages, Sentry has the expertise to help you develop an insurance program designed to fit your business's needs.