1. a small musical instrument with bellows and buttons or keys that is played by squeezing and stretching
2. coiled razor wire or barbed wire used as a barrier
Usage: military

1. to fold or collapse in a series of pleats like an accordion

Examples

• The street musician played a lively tune on his concertina.
• She learned to play the concertina from her grandfather.
• The military base was surrounded by concertina wire.
• The car’s front end concertinaed after hitting the wall.
• The metal barrier concertinaed under the impact.
• He pulled out his concertina and began to play folk songs.
• The accordion-style door concertinaed to save space.