All those wretched quarrels, in his humble opinion, stirring up bad blood, from some bump of combativeness or gland of some kind, erroneously supposed to be about a punctilio of honour and a flag,.
disapproval If you stir up a particular mood or situation, usually a bad one, you cause it. As usual, Harriet is trying to stir up trouble I thought at first that Jay had been stirring things up
If something stirs up dust or stirs up mud in water, it causes it to rise up and move around. They saw first a cloud of dust and then the car that was stirring it up
arouse or excite feelings and passions; "The ostentatious way of living of the rich ignites the hatred of the poor"; "The refugees' fate stirred up compassion around the world"; "Wake old feelings of hatred"