Clam up and Fess up

Opposite meaning terms

Clam up verb - To stop talking.

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Fess up is an antonym for clam up.

Fess up verb - To make an acknowledgment of something unpleasant as true or valid.

Usage example: he immediately fessed up once it was clear the cops had the goods on him

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Clam up is an antonym for fess up.

Cite this Source

Fess up and Clam up. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/clam_up/fess_up

Clam up & Fess up. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/clam_up/fess_up>.

Fess up or Clam up. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/clam_up/fess_up.

Google Ngram Viewer shows how "clam up" and "fess up" have occurred on timeline