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1. To cause something to disperse or evaporate through heating. Don't worry, most of the alcohol will burn off once you pour the wine into the hot pain. When will this fog burn off?
2. To use fire to destroy existing vegetation. We need to burn off the field before the next planting season.
[for some excess volatile or flammable substance] to burn away or burn up. A film of oil on the surface of the water was burning off, making dense black smoke. The alcohol burned off and left a delicious flavor in the cherries jubilee.
burn something off somethingand burn something off
to cause excess volatile or flammable substance to burn until there is no more of it. We burnt the gasoline off the water's surface. Why did you burn off the gasoline?
1. Dissipate by heat, as in The sun will soon burn off the morning fog.
2. Clear land by burning vegetation, as in They've decided to burn off part of the field to prepare it for another planting. This practice has long been common in many parts of the world, but the precise term dates only from the first half of the 1800s.