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moonlight (n.)

"light of the moon," mid-14c., from moon (n.) + light (n.).

moonlight (v.)

"hold a second job, especially at night," 1957 (implied in moonlighting), from moonlighter (1954), from the notion of working by the light of the moon; see moonlight (n.). Related: Moonlighting. Earlier the word had been used to mean "commit crimes at night" (1882).