persist in, persevere, carry on, plug away*; see continue 1, endure 1.
"keep-at." YourDictionary, n.d. Web. 09 December 2018. <https://thesaurus.yourdictionary.com/keep-at>.
keep-at. (n.d.). Retrieved December 09th, 2018, from https://thesaurus.yourdictionary.com/keep-at
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