sully (one's) hands(redirected from sullying his hands)
sully (one's) hands
To partake in particularly underhanded, illicit, or illegal work or activities. The public can't be allowed to think that I, a senate hopeful, would ever sully my hands with a tax-evasion scheme such as that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
sully your handsFORMAL
If someone sullies their hands by doing something, they do something unpleasant or wrong. He had no intention of sullying his hands by playing politics. He would not sully his hands in trade. Note: To sully something means to stain it.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012