Millers Formal Wear What Does The Analogy "turn Off The Lights" Mean?

What does the analogy "turn off the lights" mean? - millers formal wear

Here is the context of the sentence:
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Phil Miller, spokesman for the personnel policies of companies in the healthcare AMN Healthcare and author of "The last doctor in America, please out the light?
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Apparently, this "Lights Out" is an analogy. Could someone please explain what it means and how to use it, and if they are used in professional writing?

Thank you,