Clammed up
Mum and clammed up are semantically related in quiet topic. In some cases you can use "Mum" instead an adjective "Clammed up", when it comes to topics like silent, taciturn, uncommunicative, secretive.
Mum
Mum adjective - Deliberately refraining from speech.
Clammed up and mum are semantically related in silent topic. Sometimes you can use "Clammed up" instead an adjective "Mum".
Mutual synonyms
Cite this Source
Mum and Clammed up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/clammed_up/mum
Clammed up & Mum. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/clammed_up/mum>.
Mum or Clammed up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/clammed_up/mum.
Google Ngram Viewer shows how "clammed up" and "mum" have occurred on timeline