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lose one's temper

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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.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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