To renounce, reject, or promise solemnly never to do something again; to swear an oath against something.
From Old English 'for-' (away from, against) + 'swear' (to take an oath). The prefix shows rejecting or turning away from something by oath, creating a strong legal or moral commitment.
Famously, Prospero in Shakespeare's 'The Tempest' 'forswears' his magic—it's the oath-taking word for breaking free, making it perfect for dramatic renunciation of power and identity.
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