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| keep sentry; stand sentry; be on guard duty (The main witness was Earl Morrison, at that time serving with the US 1st Division Marine Corps. At 1--1.30 a.m. on a still night he was on guard duty with two other men and they were sitting on top of a bunker, talking and looking around. (Janet & Colin Bord, "Unexplained Mysteries of The 20th Century") ART Vancouver) | |||
| keep guard; do sentry-go; be on patrol duty; keep guard over; mount | |||
| be on sentry duty | |||
| mount guard; stand guard | |||
| pull the guard | |||