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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Temperatures in that area often fell below freezing at night.—
Catherine Nicholls,
CNN Money,
19 July 2025 -
Maple taffy: Made by boiling and freezing maple syrup on snow or ice to create a chewy candy, maple taffy is best eaten fresh, but it can be frozen for up to two months.—
Katie Rosenhouse,
Southern Living,
19 July 2025
Verb
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Iran rejects tight restrictions on its nuclear program and has hardened its stance after Israel and the U.S. targeted its nuclear facilities in June.—
Amira El-Fekki,
MSNBC Newsweek,
8 July 2025
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They’d be hardened to anything that life and work threw their way.—
Jodie Cook,
Forbes.com,
7 July 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 24 Jul. 2025.
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