Accordion
/əˈkɔ(ɹ).di.ˌən/
noun
A small, portable, keyed wind instrument, 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.
Synonyms: squeezebox
verb
To fold up, in the manner of an accordion