be no skin off someone's back
US /bi noʊ skɪn ɔf ˈsʌm.wʌnz bæk/
UK /bi noʊ skɪn ɔf ˈsʌm.wʌnz bæk/

1.
bukan urusan, tidak masalah
to not be a problem or concern for someone; to not affect someone negatively
:
•
It's no skin off my back if you don't want to come.
Itu bukan urusanku jika kamu tidak mau datang.
•
Whether they agree or not, it's no skin off my back.
Apakah mereka setuju atau tidak, itu bukan urusanku.