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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The race kicks off in below-freezing temperatures in Antarctica before runners travel to Cape Town, South Africa; Perth, Australia; Abu Dhabi, United Arab Emirates; Algarve, Portugal; Cartagena, Colombia and finishing in Miami.—
Tereza Shkurtaj,
PEOPLE,
18 Apr. 2026 -
Monday's highs only in the 50s and possible frost or freeze advisories by Tuesday morning with lows in the mid-30s, which is the average low in early December.—
Bill Kelly,
CBS News,
18 Apr. 2026
Verb
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Chenoweth says authoritarians are getting better at controlling information flow, criminalizing protest, hardening security and police forces, and coordinating with other authoritarians.—
Chris John Amorosino,
Hartford Courant,
16 Apr. 2026
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And top Democrats are hardening their opposition.—
Burgess Everett,
semafor.com,
16 Apr. 2026
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“Firm (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/firm%20%28up%29. Accessed 18 Apr. 2026.
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