0 past simple and past participle of concertina
The second attribute was compaction, so termed because the paper was either rolled tightly or folded loosely (concertinaed).
Had the business not been concertinaed in such a way, the problems could have been avoided.
That would have concertinaed the process and would have led to a much shorter, crisper debate and could, perhaps, have resolved any outstanding issues.
That number has been concertinaed to a great degree.
