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 below-freezing temperatures in Metro Detroit are especially hard on people who are homeless.—
Julia Avant,
CBS News,
27 Jan. 2026 -
The Memphis area is not expected to get above freezing temperatures for multiple days, so the snow on the ground and on roadways might hang around for a while.—
Brooke Muckerman,
Memphis Commercial Appeal,
27 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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The Czech Republic’s new government will seek to transform the defense industry into an engine of the nation’s export economy as the flagship auto sector faces stiffening competition, Karel Havlicek, minister for industry and trade, told us.—
Suzanne Lynch,
Bloomberg,
27 Jan. 2026
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These include stiffening of blood vessels, changes in heart muscle function and impaired ability of the cardiovascular system to respond to exertion.—
Katia Hetter,
CNN Money,
16 Jan. 2026
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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 1 Feb. 2026.
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