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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Example Sentences
Recent Examples of Synonyms for firm (up)
Verb
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Stop watering when the ground freezes and restart the watering routine in spring once garlic starts to sprout.—
Lauren Landers,
Better Homes & Gardens,
6 Sep. 2025 -
Emails included in the lawsuit between Zuckerberg and the company's tech support team date back to May 2020, in which similar account freezes from 2017 are mentioned.—
John Tufts,
IndyStar,
6 Sep. 2025
Verb
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But as Beijing hardens its ties with Russia, North Korea and other nations unfriendly to the West, the emergence of two camps and the contest between them appears clearer than ever.—
Simone McCarthy,
CNN Money,
6 Sep. 2025
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Veith realized this reversible property, known as shear thickening, could be used to create a protective additive that instantly hardens under impact, dramatically reducing the risk of fires in lithium-ion batteries.—
Bojan Stojkovski,
Interesting Engineering,
6 Sep. 2025
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“Firm (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/firm%20%28up%29. Accessed 9 Sep. 2025.
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