黄泉

the Yellow Springs / the underworld of Chinese mythology / the equivalent of Hades or Hell

yellow / pornographic / to fall through

spring (small stream) / mouth of a spring / coin (archaic)

to visit the Yellow Springs / to die

lit. to return to the Yellow Springs 黃泉|黄泉[Huang2 quan2] (idiom) / fig. to die / to meet one's end