We found one dictionary that defines the word knock someone's lights out:

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1. knock someone's lights out: Wiktionary

Definitions from Wiktionary (knock someone's lights out) ▸ verb:  Synonym of punch someone's lights out ▸ Words similar to knock someone's lights out ▸ Usage examples for knock someone's lights out ▸ Idioms related to knock someone's lights out ▸ Wikipedia articles (New!) ▸ Words that often appear near knock someone's lights out ▸ Rhymes of knock someone's lights out ▸ Invented words related to knock someone's lights out