1. past tense of concertina; to compress or squeeze together in a series of folds or ridges, like the bellows of a concertina
Usage: British English; often used in descriptions of physical collapse or compression

1. compressed or folded into a series of ridges or pleats; having a concertina-like appearance
Usage: British English; descriptive term for objects or structures with accordion-like folds

Examples

• The car was concertinaed in the collision, its metal frame twisted beyond recognition.
• The concertinaed cardboard boxes took up much less space in the storage room.
• When the train crashed, several carriages concertinaed into one another.
• The concertinaed fabric created an interesting textured pattern on the garment.
• The metal pipe concertinaed under the immense pressure.
• She concertinaed the paper fan by folding it back and forth repeatedly.