prey on/upon someone's mind
idiom
: to make someone worry : to be constantly on someone's mind
Her growing debts preyed on her mind.
The thought that he could have done better preyed on his mind.
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“Prey on/upon someone's mind.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prey%20on%2Fupon%20someone%27s%20mind. Accessed 22 Feb. 2025.
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