大小便

using the toilet / urination and defecation

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

dimension / magnitude / size / measurement / large and small / at any rate / adults and children / consideration of seniority

small / tiny / few / young

to urinate / to pass water / urine

urine / to urinate / (euphemism) penis or vulva

plain / informal / suitable / convenient / opportune / to urinate or defecate / equivalent to 就[jiu4]: then / in that case / even if / soon afterwards

used in 便宜|便宜[pian2 yi5] / used in 便便[pian2 pian2] / used in 便嬛[pian2 xuan1]