noun / adjective
accordion
uh-KOR-dee-un/əˈkɔːrdiən/
A bellows-driven musical instrument with keys or buttons.
The accordion has a piano keyboard, rows of buttons, and pleated bellows.

Etymology
Akkord means a musical chord or concord of sounds. The instrument’s name uses that musical sense of harmony, with an ending modeled on names such as clarion.
In context
pushing in and out like you're playing an accordion or something. So just push in, come back out, push back in again
More examples
- Her accordion has piano-style keys on one side.
- An accordion door folds back against the wall.
- The band includes two accordions and a violin.
Forms
accordion · accordions
Similar words
- concertina
- A smaller bellows instrument, usually with buttons at both ends.