Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • intransitive verb To decide or declare that one will not or will no longer engage in (an activity or habit, for example).
  • intransitive verb To decide or declare that one will not or will no longer use or be associated with (something).
  • intransitive verb To disavow under oath.
  • intransitive verb To make (oneself) guilty of perjury.
  • intransitive verb To swear falsely; commit perjury
  • idiom (be forsworn) To commit perjury.

from The Century Dictionary.

  • To reject or renounce upon oath; renounce earnestly, determinedly, or with protestations; abjure.
  • To deny upon oath or with strong asseveration.
  • Synonyms Renounce, Recant, Abjure, etc. See renounce. For forswear one's self, see perjure.
  • To swearfalsely; commit perjury.

from the GNU version of the Collaborative International Dictionary of English.

  • intransitive verb To swear falsely; to commit perjury.
  • transitive verb To reject or renounce upon oath; hence, to renounce earnestly, determinedly, or with protestations.
  • transitive verb To deny upon oath.
  • transitive verb to swear falsely; to perjure one's self.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive To renounce or deny something, especially under oath.
  • verb intransitive To commit perjury.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb formally reject or disavow a formerly held belief, usually under pressure

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English forsweren, from Old English forswerian : for-, wrongly; see for– + swerian, to swear; see swear.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Middle English forsweren, from Old English forswerian ("to swear falsely"). More at for- +‎ swear.

Examples

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