let blood
slaughter, kill, massacre
Cym IV.ii.168[Arviragus to Belarius, of disguised Innogen] to gain his colour / I'ld let a parish of such Clotens blood
JC III.i.152[Antony to all] I know not ... / Who else must be let blood
SHAKESPEARE'S WORDS © 2020 DAVID CRYSTAL & BEN CRYSTAL