go postal
idiom
US, informal
: to suddenly behave in a very violent or angry way
She suddenly went postal and started yelling at the customers.
If he calls me this late again, I'm going to go postal on him.
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“Go postal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/go%20postal. Accessed 24 Apr. 2024.
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