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3. uncharted waters

uncharted waters

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uncharted waters

A situation or circumstance that is foreign, unclear, or unfamiliar and which may be dangerous or difficult as a result. We're starting to get into uncharted waters exploiting these tax loopholes. If we aren't careful, the government may crack down on us hard! John keeps himself so closed off that I've never understood the uncharted waters of his emotions.

See also: water