as in to freeze
to become physically firm or solid
wait for the modeling clay to firm up before handling the finished pot
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Recent Examples of Synonyms for firm (up)
Verb
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Recipe Tips From The Test Kitchen To freeze this dish, let any leftover soup cool completely.—
Elizabeth Mervosh,
Southern Living,
4 Oct. 2025 -
Early this year, the Danish Defense Intelligence Service assessed the risk from Russia once its Ukraine war stops or freezes in place.—
Jason Ma,
Fortune,
4 Oct. 2025
Verb
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Subsequent congressional investigations, post-campaign books, and news stories have only hardened public opinion that, with his mental acuity faltering and physical stamina limited, Biden should have stepped aside after a single term.—
David Mark,
The Washington Examiner,
3 Oct. 2025
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Make sure to slowly harden off (acclimate) plants started indoors to avoid transplant shock.—
Kim Toscano,
Southern Living,
3 Oct. 2025
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“Firm (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/firm%20%28up%29. Accessed 10 Oct. 2025.
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