concertina

A musical instrument, like the various accordions, that is a member of the free-reed family of musical instruments, typically having buttons on both ends.

Coiled barbed wire for use as an obstacle.

Something multiply folded like a concertina, such as a folded book, a bus door or a set of picture frames that are folded together.

A type of booklet label, consisting of up to 32 pages of booklet as an insert.

To become compressed into a shape reminiscent of a concertina.

To be drawn closer and farther apart repeatedly, or up and down, as if situated on a working concertina's folds.