Beef up
Beef up verb - To increase the ability of (as a muscle) to exert physical force.
Mutual synonyms
Cite this Source
Stiffen and Beef up. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/beef_up/stiffen
Beef up & Stiffen. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/beef_up/stiffen>.
Stiffen or Beef up. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/beef_up/stiffen.
Google Ngram Viewer shows how "beef up" and "stiffen" have occurred on timeline