Clam up
Clam up verb - To stop talking.
X out
X out verb - To show (something written) to be no longer valid by drawing a cross over or a line through it.
Mutual synonyms
Cite this Source
X out and Clam up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/clam_up/x_out
Clam up & X out. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/clam_up/x_out>.
X out or Clam up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/clam_up/x_out.
Google Ngram Viewer shows how "clam up" and "X out" have occurred on timeline