twilight zone

American  

noun

1. the lowest level of the ocean that light can reach.

2. 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.

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twilight zone British  

noun

1. any indefinite or transitional condition or area

2. an area of a city or town, usually surrounding the central business district, where houses have become dilapidated

3. the lowest level of the ocean to which light can penetrate

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Etymology

Origin of twilight zone

First recorded in 1905–10

Example Sentences

"It almost felt like being in the twilight zone," he added.

From BBC • Feb. 23, 2026

Starbucks is facing a similar situation: No one wants to spend a lot of time there, but grab-and-go coffee is usually cheaper elsewhere, so the appeal of this twilight zone is shaky.

From Slate • Dec. 22, 2025

The twilight zone teems with life, including krill, squid, fish, octopus, and delicate jelly-like species.

From Science Daily • Nov. 8, 2025

“I was in the twilight zone for a little bit,” Kennedy coach Troy Cassidy said about the back-and-forth battle.

From Los Angeles Times • Aug. 23, 2025

Dimple felt like she was in the twilight zone.

From "When Dimple Met Rishi" by Sandhya Menon