Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: forswerian

forswear

 verb
     
for‧swear past tense forswore, past participle forsworn [transitive] formal
to stop doing something or promise that you will stop doing something [= renounce]:
We are forswearing the use of chemical weapons for any reason.
Definition from the Longman Dictionary of Contemporary English
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