To accustom someone to something is to make them used to it through repeated experience. Over time, the thing feels normal or routine.
From Old French 'acostumer' and Medieval Latin 'accostumare', from 'ad-' (to) + 'costume' (custom, habit). It literally means 'to bring into custom or habit'.
Accustom is about building a new 'custom' inside you. Your brain literally rewires so that what was once strange becomes your new normal.
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