twilight

• n. 夜明け、夕暮れ; 薄明かり; 衰退期; ぼんやりした状態
• adj.薄暗い、薄暗い照明；たそがれ時

twi-、2、ここでは虚数、光、ライト。比喩的用法。

twilight

twilight: [15] Twilight is etymologically ‘light between day and night’. The word was compounded from the prefix twi- ‘two’, apparently used here in the sense ‘between’ (between itself comes from the same ultimate source as two) and light. German has the parallel zwielicht.
=> two

twilight (n.)

"light from the sky when the sun is below the horizon at morning and evening," late 14c. (twilighting), a compound of twi- + light (n.) Cognate with Middle Flemish twilicht, Dutch tweelicht (16c.), Middle High German twelicht, German zwielicht. Exact connotation of twi- in this word is unclear, but it appears to refer to "half" light, rather than the fact that twilight occurs twice a day. Compare also Sanskrit samdhya "twilight," literally "a holding together, junction," Middle High German zwischerliecht, literally "tweenlight." Originally and most commonly in English with reference to evening twilight but occasionally used of morning twilight (a sense first attested mid-15c.). Figurative extension recorded from c. 1600.

Twilight zone is from 1901 in a literal sense, a part of the sky lit by twilight; from 1909 in extended senses in references to topics or cases where authority or behavior is unclear. In the 1909 novel "In the Twilight Zone," the reference is to mulatto heritage. "She was in the twilight zone between the races where each might claim her ...." The U.S. TV series of that name is from 1959.

1. I am getting old.I am in the twilight of my life.

私は年を取って、生命の晩年になりました。

2.They fell into that twilight zone between military personnel and civilian employees.

彼らは軍隊員と民間人従業員の間の身分の定義がはっきりしない人になった。

3.Now both men are in the twilight of their careers.

現在、2人の事業はいずれも没落期に入っている。

4.The twilight had turned to a deep blackness.

夕闇が濃くなり、真っ暗になった。

5.It was hard to see him clearly in the twilight .

ぼんやりした夕闇の中で彼を見苦しい。