a small musical instrument, typically polygonal in form, played by stretching and squeezing between the hands to work a central bellows which blows air over reeds, each note being sounded by a button 六角形手风琴。 比较 accordion ■[as modifier]opening or closing in multiple folds 多重折叠的 concertina doors. 折叠门。
[with obj.]extend, compress, or collapse in folds like those of a concertina 伸展(或压缩、折叠)成褶皱状 [as adj. concertinaed]big rolls of concertinaed wire. 大卷的折叠金属丝。 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。