to fold, crush together, or collapse in the manner of a concertina: The car concertinaed when it hit the truck.
verb (used with object)
4.
to cause to fold or collapse in the manner of a concertina.
adjective
5.
of, pertaining to, or resembling a concertina: concertina pleats.
Origin: apparently coined by the original instrument's inventor, English instrument-maker Charles Wheatstone (1802–75), who patented it in 1829; cf. concertino, seraphina a similar instrument
a small hexagonal musical instrument of the reed organ family in which metallic reeds are vibrated by air from a set of bellows operated by the player's hands. Notes are produced by pressing buttons