Definition of on someone's case
- Her brother is always on her case about the clothes she wears.
: some person : somebody
: a set of circumstances or conditions
: a situation requiring investigation or action (as by the police)
: the object of investigation or consideration
: a box or receptacle for holding something
: a box together with its contents
: to enclose in or cover with or as if with a case : encase
: to line (something, such as a well) with supporting material (such as metal pipe)
: to inspect or study especially with intent to rob
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