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To flee hastily; to clear out or depart quickly. We lit out for the safe house as soon as we heard the police sirens in the distance. Everyone else lit out there when the manager announced we would be doing a stock-take at the end of the shift.
1. n. bedtime. It’s lights out, kids. Radios off, too!
2. n. death; time to die. (Underworld.) It’s lights out for you, chum.