Back In My Arms Again Lyrics

Lyric discussion by tugit 

Cover art for Back In My Arms Again lyrics by Kenny Chesney

Confusion again: "hindsight is 20-20", what does that mean? And it's kind of strange that he leaves her on the front porch "drying"... Wonder how the writer of the song came up with that one - sounds to me like he actually experienced something like that 'cause how do you make up a line like that?