破は顔がん一いっ笑しょう

noun, noun or participle which takes 'suru', intransitive verb

smiling broadly; breaking into a smile

A yojijukugo describing a sudden, broad smile that lights up the face, often after tension or seriousness. Used as a noun or with する as an intransitive verb.

• 彼かれの冗じょう談だんに、彼かの女じょは破は顔がん一いっ笑しょうした。

  At his joke, she broke into a broad smile.

• 厳きびしい表ひょう情じょうだった祖そ父ふが、孫まごの顔かおを見みて破は顔がん一いっ笑しょうした。

  My grandfather, who had a stern expression, broke into a smile when he saw his grandchild.