dirty work

idiomatic uncountable

(idiomatic) One or more unpleasant tasks, assignments, or employment duties, especially those of a disreputable or illicit nature.

Japanese Meaning

汚い仕事（不名誉で面倒な、いやがらせの任務や業務） / 嫌な仕事（避けたくなるような、手を出しにくい任務や業務） / 厄介な仕事（誰かに押し付けられがちな、面倒で不評な役割）

He hired someone else to do the dirty work so his hands would stay clean.

彼は手を汚さないように、汚れ仕事を他の誰かにやらせた。

Sense（1）

(idiomatic) One or more unpleasant tasks, assignments, or employment duties, especially those of a disreputable or illicit nature.