be no skin off someone's back
US /bi noʊ skɪn ɔf ˈsʌm.wʌnz bæk/
UK /bi noʊ skɪn ɔf ˈsʌm.wʌnz bæk/
1.
to not be a problem or concern for someone; to not affect someone negatively
:
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It's no skin off my back if you don't want to come.
•
Whether they agree or not, it's no skin off my back.