JLPT N1
～たら最後 / たが最後（たらさいご / たがさいご）
if you do… (there will be a negative result); once you do… it's over
Structure / Usage
Verb (たら / た-form) + 最後
Example Sentences
あのゲームを始めたら最後、やめられなくなる。
Once you start that game, you won't be able to stop.
彼に秘密を話したが最後、みんなに広まる。
Once you tell him a secret, it will spread to everyone.
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