意い表ひょうを突つく

expression, godan verb (-ku)

take by surprise; do something unexpected

Used when someone's action or statement catches another person off guard, often in a striking or clever way.

• 彼かれの提てい案あんは意い表ひょうを突つくものだった。

  His proposal was something that took everyone by surprise.

• 意い表ひょうを突つく質しつ問もんに、彼かれは言こと葉ばを詰つまらせた。

  He was at a loss for words at the unexpected question.