squeeze box

noun4

1. •
   (informal) An accordion or concertina.

   • Mama's got a squeeze box she wears on her chest. / From when Daddy comes home, he never gets no rest. / Because she's playing all night, and the music's all right. — 1975
2. •
   A container that fits tightly around an animal to immobilize it for medical treatment, transportation, etc.
3. •
   Synonym of hugbox (“a therapeutic device”).
4. •
   A box with an adjustable opening used by cavers to practise crawling through tight spaces.