Psalms 51:14 - Ellicott's Commentary On The Whole Bible

Bloodguiltiness... — Literally, as in the margin, bloods. So in LXX. and in Vulg., but thus hardly making it clear whether the word implies the guilt of blood already shed or anticipated violence. The latter would rather have taken the form of Psalms 59:2, “from men of blood.” Probably we should read “from death,” as in Psalms 56:13.