Is there a general meaning for `切る` on the end of verbs?

I think it might have to do with "completely doing" something. If that's the
case, how does `～切る` on the end of verbs differ from `～てしまう`, for example how
do `成り切った` and `なってしまった` "turned completely into" differ in meaning?

Additionally:

  * How does the meaning of `支え切れなくなる` differ from `支えられなくなる` "become unable to support"? Can `支え切れなくなる` mean "will go past the point of being able to support"?

  * How does `疲れ切った` differ from `疲れた` "exhausted"?   
Does `完全に疲れた` "completely exhausted" have a similar meaning to `疲れ切った`?

  * What is the relationship between `割り切る` and `割る`?
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2012-03-13T01:51:38.017
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2012-03-16T15:52:47.233
2012-03-13T11:10:55.033
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grammar suffixes
The meaning of 切る on the end of verbs
1. Yes. The meaning of `きる` common to those examples is to `complete doing ...`.

  2. `てしまう` does not necessarily mean `complete doing ...`. So they are different.
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2012-03-13T02:07:52.990
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2012-03-13T02:07:52.990
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Well, ～しまう kinda means that you ended up doing something, or that something
happened that you don't feel so great about. I often use it at work to say
something like そうすると、難しくなってしまう which gives the nuance that it's regrettable,
but it will ended up being hard if you do it like that.

～きる means do something thoroughly. A common example is 本当にそう言い切れるのか？ Can you
REALLY say that (and mean it/be sure about it)? Another one would be 使い切る
which means use something until it's gone/used up.
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2012-03-16T15:52:47.233
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