blowoff

[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. 2014.
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Example sentences
Wood siding reduces blowoff on walls during high winds.
The size of blowoff and blowdown piping shall be not less than the size of the connection on the boiler.
Flame stable with no blowoff from the burner or flashback into the burner.
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