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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.
Salvador Dali: Repulsion is the sentry that guards the gate to all that we most desire. Pierre Gilliard: The sailor Nagorny, who attended to Alexei Nikolaevitch, passed my window carrying the sick boy in his arms, behind him came the Grand Duchesses loaded with valises and small personal belongings.