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Phrase(s): Don’t touch that dial!
1. Lit. Do not change your radio or television dial, but continue to listen to this station. (From broadcasts in the days when tuning was done with a dial.) • Don’t touch that dial. Stay tuned for The Adventures of Blondie. 2. Fig. Do not change anything or divert your attention. • Don’t touch that dial. Remember what you hear in today’s lecture. It will be on the test.
McGrawhill's American Idioms And Phrasal Verbs