ㄒㄧㄤxiāngㄐㄧㄢˋjiànㄏㄣˋhènㄨㄢˇwǎn

  1. 遺憾認識史記·一一·平津》:天子召見安在相見!』」形容一見如故意氣相投·千里六么·明豔當時相見恨晚彼此心目。」相逢恨晚」。相知恨晚寇仇

to regret not having met earlier (idiom)​; It is nice to meet you finally., It feels like we have known each other all along.