blow·off

[bloh-awf, -of]
noun
1.
a current of escaping surplus steam, water, etc.: The safety valve released a violent blowoff from the furnace.
2.
a device that permits and channels such a current.
3.
Slang. a person who brags or boasts; a blow-hard.
4.
a temporary, sudden surge, as in prices: The Federal Reserve Board's credit tightening could cause a blowoff in interest rates.

Origin:
1830–40; noun use of verb phrase blow off

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Blowoff is always a great word to know.
So is interrobang. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Example sentences
Wood siding reduces blowoff on walls during high winds.
Flame stable with no blowoff from the burner or flashback into the burner.
The size of blowoff and blowdown piping shall be not less than the size of the connection on the boiler.
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