box room
From Longman Dictionary of Contemporary EnglishRelated topics: Housebox roomˈbox room noun [countable] British EnglishDHH a small room in a house where you can store thingsExamples from the Corpusbox room• It was very small, hardly more than a box room, with a single high window.• Margaret had made me a bed in the box room.• Many a day I just sat in the box room.