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: to become very angry, upset, etc.
Don't have a cow! I said I'd take care of the problem and I will.
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From the Editors at Merriam-Webster
A Whole Barnyard of Farm Idioms
24 down-home turns of phrase
have a blitz on
have a bun in the oven
have a chip on one's shoulder
have a cow
have a devilish time
have a few
have a few minutes/moments
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to clear from alleged fault or guilt
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