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JLPT N1 Grammar

たら最後 / たが最後

N1Condition

N1 · Condition · ta-form verb + ら最後 / が最後

once...then all is lost; once

ta-form verb + ら最後 / が最後

Shows that once the first event happens, an irreversible or hard-to-change negative result follows.

Strong in tone; the following clause is usually negative, out of control, or unrecoverable.

その設定を本番で間違えたら最後、全ユーザーに影響が出る。

Once that setting is wrong in production, all users will be affected.

Do not use it for small problems easily fixed; it emphasizes serious consequences.

The first clause is like a floodgate; once opened, it is hard to close.

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