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• n  a cell in which soldiers who are prisoners are confined
• n  a room used by soldiers on guard

• A whole regiment obeyed, and Louis (no soldier) marched them stoutly into a blind alley; immediately, loyal officers put the pint-sized pretender in the guardroom.
• He went AWOL at Christmas time, he said, because a guardroom sergeant made his life miserable.
• They killed the sentry outside, burst into the guardroom, shot three more policemen, then tossed homemade bombs into the depot's gas tanks.