dirty
the dirty end of the stick the difficult or unpleasant part of a task or situation. informal
☞ A less house-trained version of the idiom is the shitty end of the stick.
2000Sunday Times (Johannesburg) I still feel a bit sorry for Hugh, he always seems to get the dirty end of the stick.
dirty weekend a weekend devoted to clandestine sexual activity. informal
2011Guardian So Chinese tourists would flock over to Hong Kong for a dirty weekend and a showing of Sex and Zen in 3D.
dirty work at the crossroads illicit or underhand dealing. humorous
☞ This expression is recorded from the early 20th century and may reflect the fact that crossroads, the traditional burial site for people who had committed suicide, were once viewed as sinister places.
1914P. G. WodehouseThe Man Upstairs A conviction began to steal over him that some game was afoot which he did not understand, that-in a word-there was dirty work at the crossroads.
do the dirty on someone cheat or betray someone. British informal
down and dirty: seedown.
get your hands dirty (or dirty your hands)
1 do manual, menial, or other hard work.
2 become directly involved in dishonest or dishonourable activity.
❶ 2013Adventures of Cecilia Bedella The thing that resonated most with me this re-read was the juxtaposition of Sunshine's primal urge to make food and feed it to people (a metaphor for creation and nurture), and her mission/calling to do what she can to destroy evil (killing, getting her hands dirty).
play dirty act in a dishonest or unfair way. informal
quick and dirty: seequick.
talk dirty speak about sex in a way considered to be coarse or obscene. informal
wash your dirty linen in public: seelinen.