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definitions

for-

a prefix meaning “away,” “off,” “to the uttermost,” “extremely,” “wrongly,” or imparting a negative or privative force, occurring in verbs and nouns formed from verbs of Old or Middle English origin, many of which are now obsolete or archaic: forbid; forbear; forswear; forbearance.

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Origin of for-

Middle English, Old English; compare German ver-, Greek peri-, Latin per-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for for-

for-

prefix

indicating rejection or prohibitionforbear; forbid
indicating falsity or wrongnessforswear
used to give intensive forceforgive; forlorn

Word Origin for for-

Old English for-; related to German ver-, Latin per-, Greek peri-
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
Word Origin and History for for-

prefix usually meaning "away, opposite, completely," from Old English for-, indicating loss or destruction, or completion, also used as an intensive or pejorative element, which is related to Old Norse for-, Dutch ver-, Old High German fir-, German ver-; from PIE *pr-, from root *per- (1) "forward, through" (see per). Probably originally in Germanic with a sense of "forward, forth," but with complex sense developments in the various languages. Ultimately from the same root as fore (adv.).

Online Etymology Dictionary, © 2010 Douglas Harper