Prop up
Prop up verb - To hold up or serve as a foundation for.
Usage example: these beams are propping up the entire roof
Underpin
Underpin verb - To hold up or serve as a foundation for.
Usage example: the central beliefs that underpin a free society
Prop up and underpin are semantically related. You can use "Prop up" instead a verb "Underpin". popular alternative
Nearby Word: underpinning
Mutual synonyms
Cite this Source
Underpin and Prop up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/prop_up/underpin
Prop up & Underpin. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/prop_up/underpin>.
Underpin or Prop up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/prop_up/underpin.
Google Ngram Viewer shows how "prop up" and "underpin" have occurred on timeline