Definitions
1.NounA musical instrument, like the various accordions, that is a member of the free-reed family of musical instruments, typically having buttons on both ends.
2.NounSomething multiply folded like a concertina, such as a folded book, a bus door or a set of picture frames that are folded together.
3.NounCoiled barbed wire for use as an obstacle.
4.NounA type of booklet label, consisting of up to 32 pages of booklet as an insert.
5.VerbTo become compressed into a shape reminiscent of a concertina."The car concertinaed into the wall."
6.VerbTo be drawn closer and farther apart repeatedly, or up and down, as if situated on a working concertina's folds.