hot under the collar

hot under the collar idiom
Angry, as in She is quick to get hot under the collar, but once the problem is ironed out she forgets it entirely. This expression alludes to the heat of anger. [c. 1900]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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