white heat

noun
1.
a stage of intense activity, excitement, feeling, etc.: The sales campaign is at white heat.
2.
an intense heat at which a substance glows with white light.

Origin:
1700–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
white heat
 
n
1.  intense heat or a very high temperature, characterized by emission of white light
2.  informal a state of intense excitement or activity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Intellectual debate was normally conducted at white heat, and discussions routinely lasted until the break of day.
The city drew a long breath and the excite ment, which had been at white heat thus far, cooled off.
But he could write, and he did so now, at white heat.
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