have blood on hands
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have (someone's) blood on (one's) hands
To be the cause of someone's death; to bear the guilt or responsibility of someone's death or injury. You may have walked away from your drunk driving accident unscathed, but you have that poor boy's blood on your hands. The police now have blood on their hands after their crackdown on protesters turned violent.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have someone's blood on one's hands
1. Lit. to have the blood of some other person on one's hands. He fell and got a terrible cut and now I have his blood on my hands as well as my shirt.
2. Fig. to be responsible for someone's death; to be guilty of causing someone's death. The teenager's blood was on the policeman's hands. The king's blood was on the hands of the murderer who killed him.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.