concertina

1.concertina doors.

折叠门。

2.a piccolo concertina

小六角手风琴

3.a request that the negotiations be concertinaed into a week-long session.

把谈判时间压缩到一周的要求。

4.The front of the bus concertinaed when it crashed into the wall.

公共汽车撞在墙上，车头压成手风琴的。