xià​liú

vulgar

下流 xià​liú
vulgar adjective
morally base, obscene, or indecent in conduct or speech

This kind of dirty joke isn't funny at all.

downstream verb
the lower course or reaches of a river

The current becomes very gentle in the lower reaches of this river.

low-class adjective
belonging to the lower social classes; mean and lowly status

In that strictly hierarchical society, this was considered a lowly profession.

Frequency

Movie subtitles
4.80 per million appears in 2% of films
Written text
2.99 per million

Sources

Definitions
CC-CEDICT