Synonyms|178Antonyms|0|Broader|2Narrower|0Related|5

64 entries under strengthen topic. ×

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step up(verb, severe, exercise)
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temper
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toughen
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whet(verb, severe, exercise)
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APASmart Define. (2015). firm up thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/firm_up/thesaurus/synonyms
ChicagoSmart Define. 2015. "firm up thesaurus" https://smartdefine.org/firm_up/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, firm up thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/firm_up/thesaurus/synonyms>.
MLASmart Define. "firm up thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/firm_up/thesaurus/synonyms>