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blow off

verb
  1. To pass gas; to break wind, to fart.

  2. To vent, usually, to reduce pressure in a container.

    "The radioactivity was released when they blew off steam from the containment vessel."

  3. To let steam escape through a passage provided for the purpose.

    "The engine or steamer is blowing off."

Synonymsbreak wind, fart

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