Synonyms|22Antonyms|2|Broader|0Narrower|0Related|3
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stiffen(verb, fix, harden, solidify)
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thicken(verb, fix, harden, solidify)
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APASmart Define. (2013). become firm thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/become_firm/thesaurus/synonyms
ChicagoSmart Define. 2013. "become firm thesaurus" https://smartdefine.org/become_firm/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2013, become firm thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/become_firm/thesaurus/synonyms>.
MLASmart Define. "become firm thesaurus" 18 May 2013. Web. 26 September 2026. <https://smartdefine.org/become_firm/thesaurus/synonyms>