条件・譲歩N1
〜ばそれまでだ
once... it's all over / if... then that's the end of it
Structure
V-ば形 + それまでだ
Explanation
V-ba + それまでだ: once the first clause happens, everything is over.
Examples
隠しても、見つかればそれまでだ。
Even if we hide it, once found, it's all over.
失敗すればそれまでだが、失敗を恐れていては前進できない。
If we fail it's all over, but fearing failure stops progress.
Note
The first clause is a fatal condition; once it happens there is no way out.