one of a series of narrow, evenly spaced parallel pleats with alternating raised and recessed folds set into cloth or other material, usually by a commercial pleating machine.
Origin of accordion pleat
First recorded in 1880–85
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tiny knife pleats
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012