Retard
Retard verb - To cause to move or proceed at a less rapid pace.
Stop up
Stop up verb - To prevent passage through by filling with something.
Mutual synonyms
Cite this Source
Stop up and Retard. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/retard/stop_up
Retard & Stop up. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/retard/stop_up>.
Stop up or Retard. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/retard/stop_up.
Google Ngram Viewer shows how "retard" and "stop up" have occurred on timeline