concertina
🇺🇸
/ˌkɑːnsərˈtiːnə/
🇬🇧
/ˌkɒnsəˈtiːnə/
A small accordion-like instrument that you play by pushing and pulling the ends.
The street performer played a lively tune on his concertina, attracting a crowd of listeners.
To collapse or fold in a concertina-like manner.
The metal fence concertinaed after the collision, blocking the road.