Blowing off steam

Meaning

Releasing built-up stress or frustration.

Usage

Used for physical or emotional outlets that help someone calm down.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Boilers needed to release steam so they would not explode, a vivid industrial metaphor.

Industrial era writers turned the literal vents into a mental-health metaphor.