Meanings
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1
noun
a room occupied by soldiers or other personnel while they are on guard duty
The officer found the night watch waiting in the guardroom.
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2
noun
a room or cell in which military prisoners are confined
The deserter spent the night under watch in the guardroom.
Thesaurus
Synonyms
Etymology
Formed from guard + room. The compound became a specific military term both for the room used by troops on guard and, by extension, for a cell under their supervision.