godan verb (-su)
carry through; achieve; complete
Emphasizes seeing something through to the end despite difficulties. Often used with 最後まで or やり遂げる as a near synonym.
彼は困難な計画を最後までやり通した。
He carried through the difficult plan to the end.
一度決めたことはやり通すべきだ。
You should see through what you've decided.