let off some steam

(verb) to get rid of one’s extra energy or emotions

Example Sentences:

A: Are you okay?
B: No, I just got fired! I’m so angry!
A: I’m sorry to hear that. What are you going to do?
B: I’m going to let off some steam by going for a bike ride.

After William’s father died, he let off some steam by going for an 8 day camping trip in Squamish.

When the long car trip was over, the young children were letting off steam by running through the playground.

From the Blogs:

As the Public Simmers, Obama Lets Off Some Steam

Media:

Similar idioms:

1. blow off some steam
2. run out of steam