〜が最後: Japanese grammar explained
~ga saigo — An unavoidable consequence once something is done ("once …, that's it").
Structure
Verb(た) + が最後
Examples
彼は寝たが最後、朝まで起きない。
かれはねたがさいご、あさまでおきない。
Once he falls asleep, there's no waking him until morning.
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