英语词源字典 - 在线词源网站

moonlight (v.)[moonlight 词源字典]: "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).[moonlight etymology, moonlight origin, 英语词源]