a musical instrument resembling an accordion but having buttonlike keys, hexagonal bellows and ends, and a more limited range.
verb (used without object), concertinaed [kon-ser-tee-nuhd] , concertinaing [kon-ser-tee-nuh-ing] .
to fold, crush together, or collapse in the manner of a concertina: The car concertinaed when it hit the truck.
verb (used with object), concertinaed [kon-ser-tee-nuhd] , concertinaing [kon-ser-tee-nuh-ing] .
to cause to fold or collapse in the manner of a concertina.
of, pertaining to, or resembling a concertina: concertina pleats.

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

concertinist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
concertina (ˌkɒnsəˈtiːnə)
1.  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
vb , -nas, -naing, -naed
2.  (intr) to collapse or fold up like a concertina
[C19: concert + -ina]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1837, from concert + fem. ending -ina. Portable musical instrument invented by Sir Charles Wheatstone, 1829.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In the middle, a chain-link fence topped with concertina wire surrounds a
  series of khaki tents.
Tango dancers take their steps, accompanied by a musician with a concertina.
The equatorial sun blazed directly overhead, cutting shadows as sharp as
  concertina wire.
Hundreds of these demonstrators pressed right up to the concertina wire.
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