Buttoned up
Keep mum and buttoned up are semantically related. In some cases you can use "Keep mum" instead a verb "Buttoned up".
Keep mum
Keep mum verb - Refuse to talk or stop talking; fall silent.
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Synonyms for Keep mum
Buttoned up and keep mum are semantically related. Sometimes you can replace term "Buttoned up" with "Keep mum", this terms are similar.
Cite this Source
Keep mum and Buttoned up. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/buttoned_up/keep_mum
Buttoned up & Keep mum. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/buttoned_up/keep_mum>.
Keep mum or Buttoned up. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/buttoned_up/keep_mum.
Google Ngram Viewer shows how "buttoned up" and "keep mum" have occurred on timeline