Fortify and Firm up

Fortify

Fortify verb - To increase the ability of (as a muscle) to exert physical force.
Usage example: he downed another granola bar to fortify himself for the rest of the bike ride

Firm up and fortify are semantically related. In some cases you can use "Firm up" instead a verb "Fortify".

Firm up

Firm up verb - To become physically firm or solid.

Fortify and firm up are semantically related. Sometimes you can use "Fortify" instead a verb "Firm up".
Cite this Source
Firm up and Fortify. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fortify/firm_up
Fortify & Firm up. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fortify/firm_up>.
Firm up or Fortify. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fortify/firm_up.
Google Ngram Viewer shows how "fortify" and "firm up" have occurred on timeline