dead as mutton
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dead as muttonBRITISH, OLD-FASHIONED
1. If a person or animal is as dead as mutton, they are completely dead. We saw a viper. It was 4 feet long and was as dead as mutton.
2. If something or someone is as dead as mutton, they are no longer active or popular. He advised him that radio was just about to become as dead as mutton because of the advent of television.