To go out is to leave home for enjoyment — or what a fire or a light does when it stops. Two senses that share nothing.
The social sense is the commoner one, and going out on a Friday means an evening somewhere else. Going out with somebody means being in a relationship, which is the standard British phrase. The extinguishing sense covers fires, candles and lights, so the lights went out is a fixed phrase. There is a third sense about tides, since the tide goes out twice a day.
Practised in Phrasal Verbs, A Man Called Ove
First appears in chapter 4 of A Man Called Ove.
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