[xià liú]
（下游） lower reaches (of a river)
the lower reaches of the Changjiang River
長江下流
（卑鄙齷齪） low-down; mean; off colour; near the bone; obscene; dirty
base acts; low-down behaviour [tricks]
下流的勾當
scurrilous attacks; coarse invectives
下流的謾罵
dirty jests; obscene jests; coarse jokes
下流的玩笑
talk dirt
說下流話
write dirt
寫下流作品
The jokes he told were quite off colour.
他說的笑話很下流。