1. 手风琴
An accordion is a musical instrument in the shape of a fairly large box which you hold in your hands. You play the accordion by pressing keys or buttons on either side while moving the two sides together and apart. Accordions are used especially to play traditional popular music.

1. a portable box-shaped free-reed instrument
the reeds are made to vibrate by air from the bellows controlled by the player

Synonym: piano accordionsqueeze box