steam(redirected from let off steam)
Also found in: Dictionary, Thesaurus, Idioms, Encyclopedia.
Related to let off steam: running out of steam, ran out of steam
steam(stēm) [AS. steam, vapor]
1. The invisible vapor into which water is converted at the boiling point.
2. The mist formed by condensation of water vapor.
3. Any vaporous exhalation.
the vapor created by heating water to 212°F (100°C).
see sterilization (2).