slow burn definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
☆ Slang a gradual working up or show of anger: often in the phrase
slow burn definition by American Heritage Dictionary
noun SlangThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A gradually increasing sense or show of anger: did a slow burn while waiting three hours in the doctor's office.
slow burn - Phrases/Idioms
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 comedian Edgar Kennedy.