真しん剣けん交こう際さい

noun

serious relationship; dating with marriage in mind

Used especially in contexts like matchmaking and dating apps to describe a relationship where both parties are looking for a marriage partner, not casual dating.

• 結けっ婚こん相そう談だん所じょでは、真しん剣けん交こう際さいを希き望ぼうする人ひとが多おおい。

  At marriage agencies, many people are looking for a serious relationship with marriage in mind.

• 彼かれとは真しん剣けん交こう際さいをしているので、将しょう来らいのことも話はなし合あっている。

  I'm in a serious relationship with him, so we also discuss our future together.