have (someone's) blood on (one's) head(redirected from have his blood on their heads)
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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.