Back up
Back up verb - Become or cause to become obstructed.
Usage example: The water pipe is backed up
Congest
Congest verb - Become or cause to become obstructed.
Cite this Source
Congest and Back up. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/back_up/congest
Back up & Congest. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/back_up/congest>.
Congest or Back up. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/back_up/congest.
Google Ngram Viewer shows how "back up" and "congest" have occurred on timeline