as in to freeze
to become physically firm or solid
wait for the modeling clay to firm up before handling the finished pot
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for firm (up)
Verb
-
Transporter 14's upper stage proceeded to deploy its payloads and release a plume of rocket propellant prior to re-entering Earth's atmosphere, which quickly froze and reflected sunlight, becoming visible to eagle-eyed stargazers in Europe.—
Anthony Wood,
Space.com,
25 June 2025 -
Even with the help of the train, rescuers hiked a mile along an exposed ridgeline above 5,000 feet, encountering high winds and freezing temperatures, to reach Wilson.—
Owen Clarke,
Outside Online,
24 June 2025
Verb
-
Democratic policies regarding immigration have evolved as attitudes, even among Latinos, have hardened after record border crossings during former President Joe Biden‘s administration.—
Naomi Lim,
The Washington Examiner,
13 June 2025
-
Now, your union advised agricultural employers to harden work sites.—
A Martínez,
NPR,
13 June 2025
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Cite this Entry
“Firm (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/firm%20%28up%29. Accessed 29 Jun. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share