Definition from Wiktionary, the free dictionary
|simpl. and trad.|
- Originally used by poets such as Li Bai for its literal meaning. Later poets such as Su Shi used this phrase as a metaphor for the beauty of a woman's eyes. This is the colloquial usage that we see today.
- This phrase can also be used in the context of someone who figuratively bats their eyes (as a way to get something that they want).