accordion vs bellows

accordion

verb
  • To fold up, in the manner of an accordion 

noun
  • A set of items (concepts, links, or otherwise) that can be packed and unpacked cognitively, or their representation as a set of virtual objects. 

  • A box-shaped musical instrument with means of keys and buttons, whose tones are generated by play of the wind from a squeezed bellows upon free metallic reeds. 

  • A vertical list of items that can be individually expanded and collapsed to reveal their contents. 

bellows

verb
  • To fold up like a bellows; to accordion. 

  • To expand and contract like a bellows. 

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

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

  • That which fans the fire of hatred, jealousy, etc. 

  • 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. 

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

How often have the words accordion and bellows occurred in a corpus of books? (source: Google Ngram Viewer )