twilight zone


noun

the lowest level of the ocean that light can reach.
an ill-defined area between two distinct conditions, categories, etc., usually comprising certain features of both; an indefinite boundary: a twilight zone between fantasy and reality.

Origin of twilight zone

First recorded in 1905–10

British Dictionary definitions for twilight zone

twilight zone

noun

any indefinite or transitional condition or area
an area of a city or town, usually surrounding the central business district, where houses have become dilapidated
the lowest level of the ocean to which light can penetrate