D defs.my
Entry 1 sense Webster, 1913

dumb down

/(dŭm` doun")/ · dumb· down · IPA
01 v. t. To render simpler, so as to be comprehensible or usable by unintelligent people; to simplify; -- of texts or devices.
  1. 1.
    To render simpler, so as to be comprehensible or usable by unintelligent people; to simplify; -- of texts or devices.