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focus(verb, fasten, concentrate, center)
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APASmart Define. (2015). sharpen thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sharpen/thesaurus/narrower
ChicagoSmart Define. 2015. "sharpen thesaurus" https://smartdefine.org/sharpen/thesaurus/narrower (accessed September 25, 2026).
HarvardSmart Define 2015, sharpen thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sharpen/thesaurus/narrower>.
MLASmart Define. "sharpen thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/sharpen/thesaurus/narrower>