light on / upon sth literary1. to notice or find something by chance偶然注意到（发现）:•His eye lit on a ruby ring.他的视线落到一枚红宝石戒指上。•I thought I might have lit upon an ancient manuscript.我想，我可能是找到了一份古代的手稿。2. if a bird or insect lights on something, it stops flying and stands on it〔鸟或昆虫〕飞落在，停落在 |