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.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.