Past tense of 'forswear'; renounced or solemnly swore an oath against in the past.
From 'forswear,' following the strong verb pattern of 'swear/swore/sworn.' This tracks the inherited Germanic verb conjugation patterns visible in modern English irregular verbs.
The past tense 'forswore' sounds more archaic than present 'forswears'—past tense historical verbs often stick around longer in literature because authors use them for dramatic, old-timey effect.
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