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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Applying too late leaves plants vulnerable to freezing temperatures.—
Mary Marlowe Leverette,
Southern Living,
8 Nov. 2025 -
These cuts mean reducing supply budgets in most departments, delaying the purchase of new math curriculum and Chromebooks, freezing hiring for nonclassroom positions and canceling contract agreements that will not disrupt operations.—
Jennah Pendleton,
Sacbee.com,
7 Nov. 2025
Verb
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In the wake of those bills, the far-right Tea Party movement helped harden Republican opposition to Obama and Democrats more broadly, and Democrats saw major losses in the 2010 midterm elections that relegated Democrats to the minority and ended Pelosi's first run as speaker.—
NPR,
NPR,
6 Nov. 2025
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Soft power that hardens into partnerships, pipelines, and actual policy shifts.—
Essence,
Essence,
6 Nov. 2025
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“Firm (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/firm%20%28up%29. Accessed 9 Nov. 2025.
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