Unenrollverb
(ambitransitive) To undo the enrolment of; to cause (oneself or another person) to not be enrolled.
Disenrollverb
(transitive) To cancel enrolment of; to remove from a list.
Disenrollverb
(transitive) To eject (a member) from a tribe.
Disenrollverb
To erase from a roll or list.