bellows

A device for delivering pressurized air in a controlled quantity to a controlled location. At its most simple terms a bellows is a container which is deformable in such a way as to alter its volume which has an outlet or outlets where one wishes to blow air.

(figurative) That which fans the fire of hatred, jealousy, etc.

Any flexible container or enclosure, as one used to cover a moving joint.

Flexible, light-tight enclosures connecting the lensboard and the camera back.

(informal, no longer used) The lungs.

To operate a bellows; to direct air at (something) using a bellows.

(figurative) To expand and contract like a bellows.

To fold up like a bellows; to accordion.