Verb たが最後 JLPT N1 Very formal / literary
〜ta ga saigo
Emphasizes 'once something happens, there is no going back'; 'once', 'as soon as', etc.
Very formal, literary - "once X happens, there's no going back"; emphasizes irreversibility, not just timing.
Formation
Verb-casual, past (た form) + が最後
Explanation
The 〜たが最後 grammar point indicates that once an action is taken or event occurs, some (often irreversible) consequence follows. In English, it can be translated as 'once', 'as soon as', or 'the moment that...'.
Example sentences
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Once he gets angry, no one can stop him.
Kare ga ichido okotta ga saigo, dare mo kare o tomeru koto wa dekimasen.
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As soon as I started this game, I played it all night.
Kono gēmu o hajimeta ga saigo, hitobanjū yari tsuzuketa.
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The moment she left the room, she never came back.
Kanojo ga heya o deta ga saigo, nido to modotte konakatta.
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Once I crossed that bridge, it was our final goodbye.
Watashi ga sono hashi o watatta ga saigo, sore ga saigo no wakare datta.