"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 (n.)
"light of the moon," mid-14c., from moon (n.) + light (n.).
权威例句
1. They started strolling down the dusty road in the moonlight.
在月光下他们开始沿着满是尘土的路漫步。
2. We went to the temple of Atlantis and saw it by moonlight.
我们去了亚特兰蒂斯神殿,在月光下游览了一番。
3. Workers in state enterprises were permitted to moonlight.