The difference between Go postal and Run amok
When used as verbs, go postal means to become erratic and aggressive, often by carrying out a spree shooting at a workplace environment, whereas run amok means to go on a rampage.
check bellow for the other definitions of Go postal and Run amok
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Go postal as a verb (intransitive, chiefly, US, informal):
To become erratic and aggressive, often by carrying out a spree shooting at a workplace environment.
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Run amok as a verb (idiomatic):
To go on a rampage; to be in an uncontrollable rage.