dis·ac·cus·tom (dĭs'ə-kŭs'təm) tr.v.
dis·ac·cus·tomed, dis·ac·cus·tom·ing, dis·ac·cus·toms To render (a person) unaccustomed to something to which the person has been previously accustomed; cause to break a habit.
[Middle English disacustome, from Old French desacostumer : des-, dis- + acostumer, to accustom; see accustom.]