soil one's hands

soil one's hands
get one's hands dirty & dirty one's hands & soil one's hands
1. Fig. to get closely involved in a difficult task. •

You have to get your hands dirty if you expect to get the gutters cleaned out.

2. Fig. to become involved with something illegal; to do a shameful thing; to do something that is beneath one. •

The mayor would never get his hands dirty by giving away political favors.

I will not dirty my hands by breaking the law.

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Dictionary of American idioms. 2013.