～通す（とおす）

About

通とおす can attach to a verb's stem form to create a compound verb. 〜通とおす compounds indicate that an action is finished, or is done continuously.

E.g. 一度いちど決きめたことは最後さいごまでやり通とおすべきだ！

"Once you decide on something, you should do it through to the end!"

E.g. 赤あかちゃんは一晩中ひとばんじゅう泣なき通どおしでした。

"The baby cried all through the night."

～通とおす includes a sense of volition, and can only be used for human actions.

Compared to ～切きる, ～通とおす focuses more on the action, rather than the point of completion.

E.g:

走はしり通とおした ⭕️ (focuses on action of running)

走はしり切きった ⭕️ (focuses on having run (e.g. X distance))

Summary

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  〜通とおす compound verbs are used to say that an action is finished or is done continuously

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  ～通とおす includes a sense of volition, and can only be used for human actions