A:一人で海外行きたいけど。。。反対しても行くよ！！

B:ダメだよ！！何かあったら知らないよ！

When this kind of nuance is used for the verb 知らない, why is the verb 知らない used
even though it means "to know" and how do you translate it exactly...?
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2016-11-24T01:15:02.820
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2016-11-24T04:45:09.323
2016-11-24T01:26:29.993
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translation meaning etymology english-to-japanese
知らない used in "I don't care"
You could think of it as " _complicitly knowing_ ".  
So, in the context of your example「知らない」it expresses something like:

  * "I'm not involved", "I won't get involved" 
  * "I don't approve" 
  * "you can't blame it on me" 
  * "it's got nothing to do with me" 

So it could be translated this way...

>   * "If anything happens to you, don't come crying to me about it."
>   * "I can't be held responsible if anything were to happen."
>

Weblio has an entry for 知らない that shows the two usages:

> ある物事に関する知識・情報を有していないこと。  
>  **関与しない** という意思の言明にも用いられる。

<http://www.weblio.jp/content/%E7%9F%A5%E3%82%89%E3%81%AA%E3%81%84>
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2016-11-24T04:17:27.687
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何かあったら、知らないよ。  
If anything happens, I don't know (about anything)

This 知らない can be translated as:  
"There is nothing that I can do"  
"I won't be able to help you"  
"I don't know about any way to help you"  
"I won't care about you"
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2016-11-24T04:45:09.323
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