from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To render (a person) unaccustomed to something to which the person has been previously accustomed; cause to break a habit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. to cause (someone) to break a habit or become unaccustomed to something that they are previously accustomed to
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To destroy the force of habit in; to wean from a custom.
from The Century Dictionary and Cyclopedia
- To cause to lose a habit by disuse; render unaccustomed as by disuse: as, he has disaccustomed himself to exercise.
Middle English disacustome, from Old French desacostumer : des-, dis- + acostumer, to accustom; see accustom.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English disacustome; compound of dis + accustom (Wiktionary)