To persistently criticize, nag, or hassle someone about their behavior or performance. Implies unwanted attention or pressure, often from someone in authority.
This phrase emerged from 1960s American slang, where 'case' referred to one's personal situation or circumstances, borrowed from legal terminology. 'Getting on someone's case' meant involving oneself in their personal business or problems. The expression gained popularity in workplace and family contexts where criticism feels intrusive.
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