Concertina
WordNet
noun
(1) Free-reed instrument played like an accordion by pushing its ends together to force air through the reeds
(2) Coiled barbed wire used as an obstacle
verb
(3) Collapse like a concertina
WiktionaryText
Noun
- A musical instrument, like the various accordions, that is a member of the free-reed family of musical instruments, typically having buttons on both ends. Concertinas are distinguished from accordions (piano or button) by the direction of the button travel when pushed. On a concertina, the buttons travel in the same direction as the bellows; on an accordion, the buttons move at a right angle to the direction of bellows travel.
- Something resembling a concertina, such as a folded book.