guard duty

a military assignment involving watching over or protecting a person or place or supervising prisoners.

1890–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Rigid guard duty was established at once, and everyone was impressed with the necessity for vigilance and watchfulness.
Being detailed on guard duty today, it was my lot to stand solitary and alone at my post when the old year died.
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