blow off意为放出，steam意为蒸汽，水汽，把怒气放出

【例句】
I went on a run to blow off steam after our fight. 　　
在打架后，为了消气，我去跑步了。

But things have gone wrong all day, and I had to blow off steam at somebody!
但是，这一天里，什么事都不顺当。我总得拿某个人出出气。