- (人)の弱点{じゃくてん}[急所]を突く
- discover someone's achilles' heel: (人)の弱点{じゃくてん}をつかむ
- achilles heel: アキレスのかかと、弁慶{べんけい}の泣き所、弱点、急所Everyone has his Achilles [Achilles'] heel. 《諺》誰でもアキレスのかかとを持っている。/弁慶の泣き所。He is a quick, energetic soccer player, but his Achilles heel [Achilles' heel, heel of Achilles] i
- achilles' heel: Achilles' heel泣き所泣き処なきどころ