meaning and origin of ‘to go postal’

‘to go postal’: to go mad—US, early 1990s—owes its origin to several recorded cases in which employees of the U.S. Postal Service have shot at their colleagues

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origin of ‘according to Cocker’

according to Cocker: correctly; reliably—early 19th century, from the name of Edward Cocker (1631-75), English arithmetician, reputed author of a popular Arithmetick

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