Bad-blood definitions

Enmity or bitterness between individuals or groups.
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A feeling of (mutual) enmity.
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(idiomatic) Feelings of hostility or ill will.
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(idiomatic) A serious feud or long-standing grudge.
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(idiomatic, dated) An inherited immoral or disturbed nature.
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Origin of bad-blood

From Charles Lamb's Essays of Elia (1823).