twilight zone

Definitions of twilight zone
1

n 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”
Synonyms:
no man's land
Type of:
ambiguity, equivocalness
unclearness by virtue of having more than one meaning

n the lowest level of the ocean to which light can reach

Type of:
Davy Jones, Davy Jones's locker, ocean bottom, ocean floor, sea bottom, sea floor, seabed
the bottom of a sea or ocean

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