blow one's top
American Heritage Dictionary of Idioms:
Top
blow one's top
1.
Also,
blow one's stack. Fly into a rage; lose one's composure. For example, If she calls about this one more time I'm going to blow my top, or Warren is generally very easy-going, but today he blew his stack. The top here has been likened to the top of an erupting volcano; the stack alludes to a smokestack. [Slang; first half of 1900s]
2.
Go crazy, become insane, as in When she regains consciousness, she just may blow her top. [Slang; first half of 1900s] Also see
flip one's lid.
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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