slow burn

noun Informal.
a gradual building up of anger, as opposed to an immediate outburst: I did a slow burn as the conversation progressed.
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World English Dictionary
slow burn
 
n
a steadily penetrating show of anger or contempt

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

slow burn

Slowly increasing anger. It is often put as do a slow burn, meaning "gradually grow angrier," as in I did a slow burn when he kept me waiting for three hours. The burn in this idiom comes from burn up in the sense of "make furious." The term was first cited in 1938 and was closely associated with co-median Edgar Kennedy.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Rather than a swift detonation, he has settled into a slow burn.
However, it is the potential and slow burn of this particular bi-regional
  partnership that has thus far escaped the critics.
Ginger beer is a good place to start, the slow burn of the ginger acting as a
  cooler in hot weather.
It's no wonder the federal judge presiding over the case has been doing a slow
  burn.
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