abjure

v. t.

  1. To renounce upon oath; to forswear; to disavow; as, to abjure allegiance to a prince. To abjure the realm, is to swear to abandon it forever.
  2. To renounce or reject with solemnity; to recant; to abandon forever; to reject; repudiate; as, to abjure errors.

v. i.

  1. To renounce on oath.