(intransitive) To let steam escape through a passage provided for the purpose.
The engine or steamer is blowing off.
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(transitive) To vent, usually, to reduce pressure in a container.
The radioactivity was released when they blew off steam from the containment vessel.
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(transitive, literally) To remove something by blowing on it.
She blew the dust off the cookbook, revealing its full title.
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