Meaning of concertina movement

concerti'na move"ment

Pronunciation: [key]
  1. a principle of table construction in which hinged sections of the frame, ordinarily folded inward out of sight, can be pulled into line with the parts of the frame ordinarily seen to permit the addition of leaves. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.