have blood on your 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.
have blood on your handsor
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.