Lights-out meaning

A signal or command to extinguish lights for the night.
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Bedtime.
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A signal, as in a military camp, etc., to extinguish lights at bedtime.
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Bedtime.
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Of or giving an overmastering performance.

Their pitcher was lights out in the final innings.

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Alternative form of lights-out.
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Third-person singular simple present indicative form of light out.
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The time at night at which artificial lights are to be turned off, a curfew or bedtime.
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The prescribed bedtime for persons living in a boarding school or staying in a hospital.

We were all expected to be in bed by lights-out.

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