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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Simply assemble and bake according to the instructions before freezing.—
Cameron Beall,
Southern Living,
18 Oct. 2025 -
As temperatures are forecast to plummet to as low as 21 degrees Fahrenheit, the National Weather Service (NWS) has issued freeze warnings for parts of Wyoming, New Mexico, Colorado, Nebraska, Kansas and Oregon on Saturday and Sunday.—
Matthew Robinson,
MSNBC Newsweek,
18 Oct. 2025
Verb
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The hardening public mood in both capitals reinforces hawkish instincts.—
Lizzi C. Lee,
Time,
17 Oct. 2025
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These are produced by precisely laying fiber strips in a mold, which is hardened using resins or other plastics to form a component.—
Georgina Jedikovska,
Interesting Engineering,
15 Oct. 2025
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Cite this Entry
“Firm (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/firm%20%28up%29. Accessed 20 Oct. 2025.
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