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3. The lights are on but nobody's-one's home

The lights are on but nobody's-one's home

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The lights are on but nobody's/no-one's home.

  (humorous)

something that you say when you think someone is stupid, or when someone does not react because they are thinking about something else It's no good expecting John to say anything. The lights are on but no-one's home.

See punch lights out

See also: but, home, lights, on