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

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

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 head. The police now have blood on their heads since their crackdown on protesters turned violent. A: "As the only adult supervising the party, of course I have his blood on my head!" B: "Sara, Billy darted out into the street even though you told him not to. It was an accident."

See also: blood, have, head, on

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