To act on one's emotions; to be carried away by feelings instead of thinking rationally.
感情に走って謝らなかったことを後で後悔した。
I later regretted not apologizing because I acted on my emotions.
議論中に感情に走ると、話し合いが前に進まない。
If you get carried away by emotions during a discussion, the conversation won't move forward.
恋愛で感情に走ると、相手の欠点を見落としがちだ。
When you let emotions take over in love, you're likely to overlook the other person's faults.