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しまえば

if ... completely; once ... is done

→ 仕舞う
auxiliary · conditional Rare #38,004
if ... completely; once ... is done Used after the て-form of a verb to express completing something, often with a sense of finality or relief, in an if/when clause.
JA: 宿題を終えてしまえば、遊べます。
EN: Once I finish my homework, I can play.
Conjugation of 仕舞う
Conditional
しまったらしまえば

あんな石早く捨ててしまえば良かった！

I should’ve gotten rid of that stone sooner!

— 天空の城ラピュタ (1986)

捨ててしまえばいいお客も構うな

Just throw it away, and don’t worry about the customer either.

— 人生スイッチ (2014)

ここも慣れてしまえばなかなか居心地がいい

Once you get used to it here, it's actually quite comfortable.

— ほんとうのピノッキオ (2019)

ねぇあなたポニョを人間にしてしまえばいいのよ。

Hey, you should just turn Ponyo into a human.

— 崖の上のポニョ (2008)