twilight zone

Noun twilight zone has 2 senses

• twilight zone(n = noun.object) - the lowest level of the ocean to which light can reach;
is a kind of davy jones, davy jones's locker, ocean bottom, ocean floor, sea bottom, sea floor, seabed

• twilight zone(n = noun.attribute) no man's land - the ambiguous region between two categories or states or conditions (usually containing some features of both); "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"
is a kind of ambiguity, equivocalness