to do or say something that helps you get rid of strong feelings or energy.

I've told her she can call me and talk any time she wants to blow off some steam.

After a long car trip, the kids need to run around a bit and let off steam.

Etymology: based on the steam engine (= a machine that uses steam), which would explode if steam were not allowed to escape into the air

• cost someone an arm and a leg
• cost someone a pretty penny
• cost someone dear
• cotton-picking
• cotton to
• cotton to someone
• cotton to something
• couch potato
• cough up
• cough up something
• could do something in sleep
• could do something in their sleep
• could do something standing on head
• could do something standing on your head
• could do something with eyes closed
• could do something with eyes shut
• could do something with one arm tied behind back
• could do something with one arm tied behind their back
• could do something with one hand tied behind back
• could do something with one hand tied behind their back
• could do something with their eyes closed
• could do something with their eyes shut
• could do with
• could do with one arm tied behind back
• could do with one arm tied behind their back