twilight zone

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twi·light zone • n. 1. a conceptual area that is undefined or intermediate: the twilight zone between the middle and working classes. ∎  a sphere of experience that appears sinister or dangerous because of its uncertainty, unpredictability, or ambiguity: schizophrenia isolates the individual in a twilight zone of terror.2. the lowest level of the ocean to which light can penetrate.

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