Clam up
Clam up verb - To stop talking.
Mutual synonyms
Cite this Source
Stultify and Clam up. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/clam_up/stultify
Clam up & Stultify. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/clam_up/stultify>.
Stultify or Clam up. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/clam_up/stultify.
Google Ngram Viewer shows how "clam up" and "stultify" have occurred on timeline