血浓于水在英语里相对应的表达是“blood is thicker than water”。

例句

I don't really get on with my brother, but I'll always support him. Blood is thicker than water, after all.

John can't come to the party on Saturday. He's going to a family wedding. Blood is thicker than water.

请注意

如果你和家族里的人都具有同样的特长或能力，另一个短语“in your blood”则特别适用，它的意思是“天生的，与生俱来的，遗传的”。

例句

Music is in my blood. My father plays the piano professionally, as did his father. My mum learned the violin from her grandmother and I can play a number of instruments.

She's the third member of her family to compete internationally. I guess athletic prowess must be in her blood.