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Yours, Etc.: Origins and Uses of 8 Sign-Offs

lose one's temper

Also, lose it. Give way to violent anger, lose self-control. For example, When she found out what Ann had done, she lost her temper, or He arrived without that important check, and then I just lost it completely. The first term dates from the early 1800s; the second slangy locution dates from the mid-1900s.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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