と言いってしまえばそれまで

expression

if you say that, it's over; you can't argue it's not ... (but); it's true that ... (but)

Used to concede a point while implying there is more to consider. Often followed by a contrasting statement or reservation. The expression literally means 'if you say that, that's the end of it'.

• 彼かれの言いうことは正ただしいと言いってしまえばそれまでだが、現げん実じつはもっと複ふく雑ざつだ。

  You could say he's right and leave it at that, but the reality is more complicated.

• この計けい画かくは無む駄だだと言いってしまえばそれまでだけど、何なにか得えるものがあるかもしれない。

  If you say this plan is pointless, that's the end of the discussion, but we might gain something from it.