on someone's case

idiom

Definition of on someone's case

informal
: frequently criticizing someone or telling someone what to do Her brother is always on her case about the clothes she wears.

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“On someone's case.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20someone%27s%20case. Accessed 7 Aug. 2020.

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