情報、内容、言葉づかいなどを、しばしば正確さや深さを犠牲にして、より簡単で知的負担の少ないものにすること。
"Critics accused the documentary of dumbing down complex scientific topics to attract a wider audience."
There is a worry that we are dumbing down the curriculum.
— Common formulation in British educational policy debate; representative of widespread journalistic usage.