Clam up
Clam up verb - To stop talking.
Usage example: the little girl clammed up when the doctor came into the room
Cite this Source
Haw and Clam up. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/clam_up/haw
Clam up & Haw. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/clam_up/haw>.
Haw or Clam up. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/clam_up/haw.
Google Ngram Viewer shows how "clam up" and "haw" have occurred on timeline