be/get on your high horseBOASTto give your opinion about something in a way that shows you think you are definitely right and that other people are wrong 自以为是，自高自大 If she’d get down off her high horse for a moment, she might realize there’s more than one point of view here. 如果她不这么自以为是的话，她可能会意识到别人对这个问题有其他看法。
be/get on your high horse• All right, all right; don't get on your high horse.• Oh, now he gets on his high horse and accuses me of being an anti-Semite!• Don't get on your high horse with me.
→ be/get on your high horse at high1(15)