c.1300, "to gather in folds," from Old French froncier, from fronce (n.), of unknown origin. Related: Frounced; frouncing.
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for frounce
Historical Examples of frounce
Frounce is a malady which will pronounce itself sometimes without much apparent cause.The Art and Practice of Hawking
Edward B. Michell