let off steam
This page is about the idiom let off steam
If you let off steam, you do something to release pent-up emotion or energy.
- After sitting quietly in class all morning, kids need time to let off steam in the playground before going back to class in the afternoon.
- It'd be good to have a punching bag somewhere in the office so we could let off steam whenever we get a bit angry or frustrated.
To "blow off steam" has the same meaning.
Origin: This idiom probably comes from the fact that boiling water produces steam which creates high pressure that will cause an explosion if it isn't released somehow.
Contributor: Matt Errey