Would need to see the context but I’m guessing a person who only comes out when it’s dark?

“Twilight existence” is a phrase used to describe a life or state that is somewhat hidden, unclear, or in-between. Just like twilight is the dim, uncertain light between day and night, a “twilight existence” suggests someone is living in a state that’s not fully “in the light” or fully “in the dark.” For example, it might refer to someone who lives on the edge of society, blending in but not fully participating, or it could describe a life that’s isolated or shadowed, without clear purpose or visibility. It often has a slightly mysterious or melancholic tone, implying that the person is not fully engaged with the world around them.

“Twilight existence” typically refers to a state of living that’s ambiguous, shadowy, or partially hidden from normal society, similar to life on the edge of visibility or significance. This expression can describe people or groups who are marginalized, those living in semi-legal or isolated conditions, or people in transition, where they exist “between” states. For instance, in literature, characters with a “twilight existence” may lead lives that are incomplete, half-realized, or marked by uncertainty. In sociology or psychology, the term might describe those who feel they don’t fully participate in or connect with mainstream society, such as undocumented workers, the homeless, or individuals isolated by illness or stigma. This phrase draws on “twilight” as the time between day and night, symbolizing something that’s not fully one thing or another. It conveys a sense of liminality—a life or experience hovering between states without fully belonging to any.