have (someone's) blood on (one's) hands

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.
See also: blood, hand, have, on
Farlex Dictionary of Idioms.

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.
See also: blood, hand, have, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

have blood on your hands

or

have someone's blood on your hands

If someone has blood on their hands or has someone's blood on their hands, they are responsible for the death of a person or people. The crowd that gathered outside his residence claimed he had blood on his hands. I want him to know he has my son's blood on his hands.
See also: blood, hand, have, on
Collins COBUILD Idioms Dictionary, 3rd ed.

have blood on your hands

be responsible for the death of someone.
See also: blood, hand, have, on
Farlex Partner Idioms Dictionary

have (somebody’s) ˈblood on your hands

be responsible for somebody’s death: He’s a tyrant with the blood of millions of innocent people on his hands.
See also: blood, hand, have, on
Farlex Partner Idioms Dictionary
See also:
  • have blood on hands
  • have blood on your hands
  • have (someone's) blood on (one's) head
  • like death warmed over
  • deal a death blow
  • between life and death
  • from the dead
  • dance with death
  • sign (someone's) death warrant
  • sign someone's death warrant