This means you do something all the way. You finish it completely. It can also mean you do something with strong feeling.
Verb [stem] + きるPrimary
This means you do something all the way. You finish it completely. It can also mean you do something with strong feeling.
長い小説を３日間で読みきった。
I finished reading the long novel in three days.
こんなにたくさんの料理、一人では食べきれません。
There's so much food, I can't possibly eat it all by myself.
マラソンを走りきった後の選手たちは、疲れきった顔をしていた。
The athletes, after completing the marathon, had completely exhausted looks on their faces.
彼は絶対にやると言い切ったから、信じてみよう。
He declared with certainty that he would do it, so let's try believing him.
人気商品は発売後すぐに売りきれてしまいました。
The popular product sold out completely right after it was released.
This form means you cannot finish something. It is often because there is too much of it. Imagine a huge plate of food. You cannot eat it all. It is not that you cannot chew. It is just too much food.
This is different from 〜終える (oeru). 〜きる means you finish something completely. It often means it was hard work. 〜終える just means you finished. It does not mean it was hard.
Don't use this when the action has no end. For example, you cannot say "live completely" or "know completely" with this grammar.
Use this when you want to show strong feelings. You can use it with words like "say" or "believe." It means you say something very strongly. Or you believe something completely. It adds a feeling of being very sure.
Often confused with(2)
Contrasts with(3)
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