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completion of an action; expression of regret
YI -G38

〜てしまう

to finish doing...
to do something that should not have been done

te form of verb +

 しまう (しまう is a Class I verb)

へやをそうじしてしまいました。I finished cleaning my room.
ケーキを5つ食べてしまいました。I end up eating 5 slices of cakes (which I regret doing.)

video icon Example: ケーキのじけん (The Cake Incident)