to forswear ones self

from The Collaborative International Dictionary of English v.0.48
Forswear \For*swear"\, v. t. [imp. {Forswore}; p. p. {Forsworn};
   p. pr. & vb. n. {Forswearing}.] [OE. forsweren, forswerien,
   AS. forswerian; pref. for- + swerian to swear. See {For-},
   and {Swear}, v. i.]
   1. To reject or renounce upon oath; hence, to renounce
      earnestly, determinedly, or with protestations.
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            I . . . do forswear her.              --Shak.
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   2. To deny upon oath.
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            Like innocence, and as serenely bold
            As truth, how loudly he forswears thy gold!
                                                  --Dryden.
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   {To forswear one's self}, to swear falsely; to perjure one's
      self. "Thou shalt not forswear thyself." --Matt. v. 33.

   Syn: See {Perjure}.
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