twilight_zone.n.02

'twilight_zone.n.02'

[twilight_zone.n.02] as in: the ambiguous region between two categories or states or conditions (usually containing some features of both)

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Examples:
but there is still a twilight zone, the tantalizing occurrences that are probably noise but might possibly be a signal
in the twilight zone between humor and vulgarity
in that no man's land between negotiation and aggression