しまえば

あんな石早く捨ててしまえばよかった

I should have 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)

ねえやもばあやも雷に打たれてしまえばいいのに！

I wish both the maid and the old nanny would get struck by lightning!

— When Marnie Was There (2014)