Definition of dumb down phrasal verb from the Oxford Advanced American Dictionary

 

dumb down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

dumb down

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dumb somethingdown

(disapproving)
 
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to make something less accurate or educational, and of worse quality, by trying to make it easier for people to understand The station denies that its broadcasting has been dumbed down.
See the Oxford Advanced Learner's Dictionary entry: dumb down