Firm up
Firm up verb - To become physically firm or solid.
Prop
Prop verb - Support by placing against something solid or rigid.
Mutual synonyms
Cite this Source
Prop and Firm up. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/firm_up/prop
Firm up & Prop. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/firm_up/prop>.
Prop or Firm up. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/firm_up/prop.
Google Ngram Viewer shows how "firm up" and "prop" have occurred on timeline