I don't know Meaning in the Cambridge English Dictionary
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Meaning of “I don't know” in the English Dictionary

"I don't know" in British English

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I don't know

informal used to ​express that you do not ​understand or are ​angry at something that someone has done: I don't know, ​however many ​notices I put up, ​people still ​park in my ​space.
(Definition of I don't know from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
Translations of “I don't know”
in Chinese (Simplified) (表示不理解或恼火)我不明白…
in Chinese (Traditional) (表示不理解或惱火)我不明白…