To break a habit or custom; to accustom someone away from their usual practice.
From dis- (reversal) + wont (from Old English gewunian, meaning custom or habitual practice). Wont as a noun survives in the phrase 'as is one's wont.'
Your 'wont' is your habitual way of doing things—'diswonting' breaks that habit. Medieval monks used discipline practices designed to diswont people from secular pleasures, making this word central to religious transformation narratives.
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