as in freezing
to become physically firm or solid
wait for the modeling clay to firm up before handling the finished pot
Synonyms & Similar Words
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Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for firming (up)
Verb
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The strikes have left tens of thousands of people across the country without power or heating amid freezing winter temperatures.—
Kosta Gak,
CNN Money,
9 Jan. 2026 -
Typically, temperatures should be just above freezing for the beginning of January.—
Karen Carter,
CBS News,
8 Jan. 2026
Verb
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Propose a clear boundary with a sibling (or close friend) to stop resentment from hardening.—
Tarot.com,
Baltimore Sun,
7 Jan. 2026
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Those upgrades involve hardening vulnerable infrastructure, improving outage detection and restoration, and preparing the grid for increasingly extreme weather.—
Chaya Tong,
Austin American Statesman,
31 Dec. 2025
Verb
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Look for signs like the cat stopping purring, stiffening, thrashing their tail, or hissing.—
Maria Azzurra Volpe,
MSNBC Newsweek,
31 Oct. 2025
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Afterwards, a squaring solution—a powdery mixture of water and a gel-like batter used in the decorative cake business—is applied to the inside of the hat’s crown to act as a stiffening agent.—
Eric Twardzik,
Robb Report,
3 Oct. 2025
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Cite this Entry
“Firming (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/firming%20%28up%29. Accessed 9 Jan. 2026.
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