～切る（きる）

About

切きる attaches to verb stems, and expresses that said verb is done "completely", or emphasizes a given state.

E.g. あの小説しょうせつは1日いちにちで読よみ切きりました。

"I read that novel all in one day."

E.g. フルマラソンの後あとで、マイクはヘトヘトに疲つかれきっている。

"After the marathon, Mike was completely and utterly exhausted."

切きる is often used in its potential form, to indicate that someone is able/unable to do something

E.g. 量りょうが多おおくて食たべきれませんでした。

"There was a lot and I couldn't finish eating it."

E.g. 初はじめてのマラソンで、最後さいごまで走はしり切きれたのはすごい。

"Running your first marathon all the way to the end is amazing."

Summary

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  切きる can attach to a verb's stem form to indicate that an action is finished, or that something is done completely

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  ～切きる can also indicate that an action is done to an extreme extent, or that something has happened "completely"