From Longman Dictionary of Contemporary Englishconcertinacon‧cer‧ti‧na1 /ˌkɒnsəˈtiːnə $ ˌkɑːnsər-/ noun [countable] APMa musical instrument like a small accordion, that you hold in both hands and play by pressing in from each side
Examples from the Corpus
concertina• Some of the wilder suggestions included a ticket puncher, a herb chopper and a concertina.• This means that the chain must be folded many times like a concertina to be accommodated in the crystal.• Accompanied by Bert Weald on his concertina, they sang a mixture of country songs and harvest hymns.• As I reached the entrance to the lift the iron concertina gate clattered open.• The tiny tracheae, which are strengthened with rings in their walls, do not flatten but shorten and expand like concertinas.• Mohandas had his own nurse and his own concertina.• We had triple concertina wire set up, claymores, and tripwires, and we even cut some fields of fire.concertinaconcertina2 verb [intransitive] British English FOLDif something concertinas, it folds together on itself→ See Verb tableOrigin concertina (1800-1900) concert 