moonlight

1. N-UNCOUNT Moonlight is the light that comes from the moon at night. 月光

They walked along the road in the moonlight. 他们在月光下沿路散步。

2. V-I If someone moonlights, they have a second job in addition to their main job, often without informing their main employers or the tax office. (常指隐瞒雇主或税务机关的) 兼职

...an engineer who was moonlighting as a taxi driver. …一位兼职做出租车司机的工程师。