to dumb sth down or to dumb down sth
1.+ programme, magazine降低…的难度；使浅显易懂
the rather specific commitments not to dumb down the BBC's news不对英国广播公司新闻进行简化的相当具体的承诺
No one favored dumbing down the magazine.没人喜欢把这本杂志通俗化。
2.+ culture, education, course降低…的要求
The expansion in student numbers is threatening to dumb down higher education.扩招有可能使高等教育质量降低。