This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A guard, especially a soldier posted at a given spot to prevent the passage of unauthorized persons.

n. The duty of a sentry; watch.

n. A guard, particularly on duty at the entrance to a military base.

n. Sentry duty; time spent being a sentry.

n. A soldier placed on guard; a sentinel.

n. Guard; watch, as by a sentinel.

n. A place of watch; a watch-tower.

n. Watch; guard: same as sentinel, 1.

n. One stationed as a guard: same as sentinel, 2.

Acting as a sentry; watching.

n. Same as centry, center.

n. a person employed to keep watch for some anticipated event

""There he go back and forrards, doing what he call his sentry go."

watchman    watcher    security guard   

flying sentry    sentry go    sentinel   

sentinel    guard   

complementary    elementary    entry    gentry    supplementary   

sentinel    policeman    guard    picket    patrol    scout    watchman    constable    trooper    warder