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concertina

1 concertina /ˌkɑːnsɚˈtiːnə/ noun
plural concertinas
1 concertina
/ˌkɑːnsɚˈtiːnə/
noun
plural concertinas
Britannica Dictionary definition of CONCERTINA
[count]
: a musical instrument that resembles a small accordion and that is played by pressing the ends together
2 concertina /ˌkɑːnsɚˈtiːnə/ verb
concertinas; concertinaed; concertinaing
2 concertina
/ˌkɑːnsɚˈtiːnə/
verb
concertinas; concertinaed; concertinaing
Britannica Dictionary definition of CONCERTINA
[no object] British
: to fold or collapse together