To break someone of a habit or accustomed practice; to make someone unaccustomed to something.
From dis- + accustom (from Old French accoustumer, 'to make familiar'). This verb creates its opposite by reversing the familiarization process.
When you 'accustom' someone to something, you get them used to it; 'disaccustom' deliberately breaks that habit—it's the verb for training someone out of a comfort zone.
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