(idiomatic, transitive) To convey some subject matter in simple terms, avoiding technical or academic language, especially in a way that is considered condescending.

(games) A guessing game, similar to charades, in which players act out, or silently pantomime, words that rhyme with a clue word. The objective is to guess a concealed word that rhymes with the clue.

(Britain, military) The offence of refusing to answer the questions of an officer.

simple past tense and past participle of dumb down

Made condescendingly simple.

(nautical) The hull of a barge, in tow of a tug, used for the carriage of cargo

(computing) A computer terminal consisting of a monitor (usually in monochrome) and keyboard, but (unlike a personal computer) having almost no processing capability, used to provide input to and receive output from a remote server, minicomputer, or mainframe.

(derogatory) A common stereotype of a blonde as a woman with low intelligence. / (by extension, rare) A man of similar type.

(philately) Synonym of mute cancel

(rare, slang, derogatory) Extremely stupid.