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Meaning of accordion-fold

ac•cor•di•on-fold

Pronunciation: (u-kôr'dē-un fōld"), [key]
— v.t.
  1. to fold into pleats resembling the bellows of an accordion: to make a fan by accordion-folding a sheet of paper.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.