This means you finish something. You keep going until it is done. You do this even if it is hard.
Verb [stem] + 通すPrimary
This means you finish something. You keep going until it is done. You do this even if it is hard.
彼は困難な状況でも、自分の信念を貫き通した。
He stuck to his beliefs all the way through, even in difficult circumstances.
この仕事は一人ではやり通せないので、手伝ってください。
I can't complete this job by myself, so please help me.
一度決めたことは、最後までやり通そうと思う。
I intend to see through to the end what I've decided on.
彼は初志を貫き通し、ついに夢を実現させた。
He held fast to his original intention and finally realized his dream.
徹夜でレポートを書き通したので、とても眠いです。
I'm very sleepy because I stayed up all night writing my report from start to finish.
This grammar shows a strong will. You decided to keep going. You did not give up. You finished what you started.
This is different from "〜ぬく" (nuku). "〜ぬく" means you finish something hard. It shows the struggle. "〜通す" means you keep doing something. You do not give up. It shows your strong will. "〜終える" (oeru) just means to finish. It does not show struggle or strong will.
Don't use this when an action happens very fast. For example, you cannot say "die through" or "understand through."
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