1. Godan verb with 'mu' ending, Transitive verb

   to shut one's mouth; to hold one's tongue; to keep silent

   Usually written using kana aloneusu. as 口を〜see 口をつぐむ

   彼は叱られているとき口をつぐんでいた。

Also written 鉗む【つぐむ】tsugumu