It would be an antonym of understanding using the prefix des-, although only for the meaning of "ally, relate" or "have authority in a matter", because it is not possible to stop understanding what has already been understood.
IT REFERS ENTIRELY TO ' '39 SEPARATION; ' OF TWO PEOPLE;INDIVIDUALS OR GROUPS. WHEN ALREADY AMONG THEM IS BROKE AN AGREEMENT COMMON OR HAVE EXTREME DIFFERENCES DEOPINIONES, THAT OCCASIONS AS A CONSEQUENCE; WHICH BREAK ALL COMMUNICATION BETWEEN THEM...