Meaning of と言ってしまえばそれまで in Japanese
Definition of と言ってしまえばそれまで
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(exp) it is certain true that ... (but); you can't argue that it's not ... (but)
「騙された」と言ってしまえばそれまでですが、「うまい話」に乗った当人であることは間違いありません。
If you say "I was tricked," well that's certainly so but there's no mistaking that you were the one who signed up on a "sweet deal".