disaccustom

From Middle English disacustome, from Old French desacostumer (“render unfamiliar”) (compare French désaccoutumer). Equivalent to dis- +‎ accustom.

disaccustom (third-person singular simple present disaccustoms, present participle disaccustoming, simple past and past participle disaccustomed)

1. to cause (someone) to break a habit or become unaccustomed to something that they were previously accustomed to