bad blood
US /bæd blʌd/
UK /bæd blʌd/

1.
確執, 遺恨, 敵意
feelings of hate or anger between people because of arguments in the past
:
•
There's been bad blood between the two families for generations.
両家には何世代にもわたって確執があった。
•
After their big argument, there was a lot of bad blood between them.
彼らの大喧嘩の後、彼らの間には多くの確執があった。