Clam up
Clam up verb - To stop talking.
Make sure
Make sure verb - Make a point of doing something; act purposefully and intentionally.
Cite this Source
Make sure and Clam up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/clam_up/make_sure
Clam up & Make sure. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/clam_up/make_sure>.
Make sure or Clam up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/clam_up/make_sure.
Google Ngram Viewer shows how "clam up" and "make sure" have occurred on timeline