The cleaning of the flues of a boiler from scale, etc., by a blast of steam.
- A sudden rupture or bursting, as of an automobile tire.
- The hole made by such a rupture.
- A sudden escape of a confined gas or liquid, as from a well.
- Slang A large party or other social affair: "Lunch was a billion-calorie blowout beside the pool” ( Vanity Fair).
- Informal A lopsided victory or thorough defeat.