forswear       
verb [ T ]  formal uk/fɔːˈsweər/ us/fɔːrˈswer/ forswore | forsworn
 决心放弃,发誓戒除
to make a serious decision to stop doing something
  to forswear all violence 发誓停止所有暴力行为 
 Synonym: abjure 
Compare: recant retract 
 
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