血で血を洗う（ちでちをあらう）

Japanese vocabulary

Meaning: to engage in a bloody feud; to have a family quarrel; to quarrel with one's own flesh and blood; to wash blood for blood

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “血で血を洗う” pronounced in real videos (YouGlish)