*light-o'-love*

n. 1. An old tune of a dance, the name of which made it a proverbial expression of levity, especially in love matters. Nares. “Best sing it to the tune of light-o'-love.” Shak. [ 1913 Webster ]

2. Hence: A light or wanton woman; a woman inconstant in love. Called also light-of-love. Beau. & Fl. [ 1913 Webster ]