I was hearing somthing in japanese and they said something like " to omou ute sa bi(?) kara kakuyoktte" my friend said it means " i thought the refrain was cool" i don't understand how she picked that up from this sentence if chorus is "gassho". Is there another way to say the word?
" to omou ute sa bi(?) kara kakuyoktte" is a little bit gibberish. However, I will focus on possible equivalent of chorus “sabi: サビ”
サビ is a catchy part of a song. As you say, a refrain should be most impressive part of the song. The part is the most memorable part which is most melodious part of a song.
ex.) "サビ" is not really a rigorously defined term. As for me, サビ in Eagles "Hotel California" should be the part "Welcome to the Hotel California~". THe famous guitar unison is an impressive part though, it may not be "サビ". For me, quasi-"サビ" though. I think "サビ" should contain lyrics. So long as I remember, in a karaoke box, for the part without lyrics they say intro, interlude, guitar riff, etc. even if they had a melody.