[ bloh-awf, -of ]
/ ˈbloʊˌɔf, -ˌɒf /
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a current of escaping surplus steam, water, etc.: The safety valve released a violent blowoff from the furnace.
a device that permits and channels such a current.
Slang. a person who brags or boasts; a blow-hard.
a temporary, sudden surge, as in prices: The Federal Reserve Board's credit tightening could cause a blowoff in interest rates.
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Origin of blowoff

First recorded in 1830–40; noun use of verb phrase blow off
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use blowoff in a sentence

  • So far as I can tell, they're the weakest point, so if the mountain lets go, that is where the blowoff will come.

    The Flaming Mountain|Harold Leland Goodwin

British Dictionary definitions for blowoff

blow off

verb (adverb)
to permit (a gas under pressure, esp steam) to be released
(intr) British slang to emit wind noisily from the anus
(tr) informal to reject or jilt (someone)
blow off steam See steam (def. 6)
noun blow-off
a discharge of a surplus fluid, such as steam, under pressure
a device through which such a discharge is made
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Idioms and Phrases with blowoff

blow off


Vent one's strong feelings; see blow off steam.


Disregard, ignore; evade something important. For example, If you blow off your homework, you're bound to run into trouble on the exam. [Slang; second half of 1900s]


Overcome, defeat easily, as in With Rob pitching, we'll have no trouble blowing off the opposing team. [Slang; 1950s] Also see blow away, def. 2.


Ignore, abandon, refuse to take part. For example, The college is blowing off our request for a new student center. [Slang; mid-1900s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.