perfumed toilet water or eau de cologne, often used in China to repel insects or refresh the skin

to reveal one's talent or show what one is capable of

lit. to not show the mountain and to not reveal the water; fig. to hide one's true talents or keep a low profile

a couple in a short-lived, improper relationship

short-lived or transient, like dew that disappears when the sun rises

a short-lived and non-binding romantic or sexual relationship, often implying it is illicit or transitory