concertina

详细解释:n. 六角形手风琴

英语解释：

名词 concertina:

coiled barbed wire used as an obstaclefree-reed instrument played like an accordion by pushing its ends together to force air through the reeds

动词 concertina:

collapse like a concertina

例句：

The lorry had concertinaed after crashing into the tree.卡车撞到大树後摺在一起。