accordion
/əˈkɔ(ɹ).di.ˌən/
/ə.ˈkɔɹ.di.ən/
noun
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A small, portable, keyed wind instrument, whose tones are generated by play of the wind from a squeezed bellows upon free metallic reeds.
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A vertical list of items that can be individually expanded and collapsed to reveal their contents.
Synonyms:
squeezebox
verb
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To fold up, in the manner of an accordion