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to accomplish; to achieve; to carry out; to fulfill; to fulfil; to realize; to execute; to perform; to do
to do ... completely; to do ... entirely
彼は周囲の期待に応え、約束を果たしました。
He fulfilled his promise.
彼は約束を果たそうと頑張っている。
He is trying hard to fulfill his promise.
小さい頃からの夢を果たすために日々努力している。
I will work hard to achieve my dream.