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  1. Oxford American Dictionary

    swell box

    • IPA[ˈswel ˌbäks]
    • n.
      a part of a large organ in which some of the pipes are enclosed, with a movable shutter for controlling the sound level.

    • noun: swell box, plural noun: swell boxes

    • 更多解釋

    swell box

    • n.
      a part of a large organ in which some of the pipes are enclosed, with a movable shutter for ...

    Oxford Dictionary