verb (used with object), forswore, forsworn, forswearing.
to reject or renounce under oath: to forswear an injurious habit.
to deny vehemently or under oath.
to perjure (oneself).
verb (used without object), forswore, forsworn, forswearing.
to swear falsely; commit perjury.

before 900; Middle English forsweren, Old English forswerian. See for-, swear

forswearer, noun

1. abjure, relinquish, forgo, forsake, abandon. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
forswear (fɔːˈswɛə)
vb , -swears, -swearing, -swore, -sworn
1.  (tr) to reject or renounce with determination or as upon oath
2.  (tr) to deny or disavow absolutely or upon oath: he forswore any knowledge of the crime
3.  to perjure (oneself)
[Old English forswearian]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. forswerian "swear falsely," also "abandon or renounce on oath," from for- "completely" + swerian "to swear."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Salaries are so low that an official has to be a saint to forswear any extra
  earning opportunities.
One answer is to forswear fossil fuels completely in favour of a mixture of
  renewables, nuclear and reduced demand.
The power of the big rackets was too much to forswear.
It is no reason to forswear knowledge of ourselves, particularly when the
  potential benefits are great.
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