Box up
Box up verb - Enclose or confine as if in a box.
Clam up
Clam up verb - To stop talking.
Mutual synonyms
Cite this Source
Clam up and Box up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/box_up/clam_up
Box up & Clam up. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/box_up/clam_up>.
Clam up or Box up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/box_up/clam_up.
Google Ngram Viewer shows how "box up" and "clam up" have occurred on timeline