Definition of the rub
formal
: something that causes a difficulty or problem
She's an amazing cook, but she rarely has time to make meals. There's the rub. Therein/There lies the rub.
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“The rub.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/the%20rub. Accessed 19 Oct. 2020.
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