Origin of disaccustomOld French desacostumer: see dis- and amp; accustom
transitive verbdis·ac·cus·tomed, dis·ac·cus·tom·ing, dis·ac·cus·toms
Origin of disaccustomMiddle English disacustome, from Old French desacostumer : des-, dis- + acostumer, to accustom; see accustom.
(third-person singular simple present disaccustoms, present participle disaccustoming, simple past and past participle disaccustomed)
- to cause (someone) to break a habit or become unaccustomed to something that they are previously accustomed to
From Middle English disacustome, from Old French desacostumer (“render unfamiliar”) (compare French désaccoutumer).