a moot point
US /ə muːt pɔɪnt/
UK /ə muːt pɔɪnt/

1.
議論の余地がある点, 未解決の問題
a subject or question about which people can argue or disagree, or about which it is not necessary to make a decision
:
•
Whether the new policy will actually be effective is a moot point.
新しい政策が実際に効果的かどうかは議論の余地がある点だ。
•
His guilt is a moot point, as he died before the trial.
彼が裁判前に亡くなったため、彼の有罪は議論の余地がある点だ。