4

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...?

3

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

0

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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