dumb something down
phrasal verb with dumb verb uk/dʌm/ us/dʌm/
informal disapproving
（尤指为了更加普及而）使…简化，将…通俗化
to make something simpler and easier for people to understand, especially in order to make it more popular
The media was accused of dumbing down the issue. 人们指责媒体将这一问题简单化了。