Meaning of “murky/uncharted waters” in the English Dictionary

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"murky/uncharted waters" in British English

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murky/uncharted waters

a situation that is not well known and may be dangerous:

In the last two chapters of the book, she enters the murky waters of male sexuality.
After the Wall Street crash, the American economy moved into uncharted waters.

(Definition of “murky/uncharted waters” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)