xiǎo​biàn

genitals

小便 xiǎo​biàn
genitals noun
euphemism for the penis or vulva

Wash your private parts when you bathe.

urinate verb
to urinate; to pass water

半夜起来小便

bàn​yè qǐ​lai xiǎo​biàn.

He got up in the middle of the night to urinate.

urine noun
urine; liquid body waste

The doctor sent him for a urine test.

Frequency

Movie subtitles
6.08 per million appears in 3% of films
Written text
3.59 per million

Sources

Definitions
CC-CEDICT