/'twaɪlaɪt; `twaɪ,laɪt/
n [U]
1 (a) faint light after sunset or before sunrise 日落後或日出前的微光; 曙光; 暮色
*I couldn't see their faces clearly in the twilight. 我在曙色朦胧中看不清他们的脸.
(b) period of this 黎明或薄暮时分
*farmers walking home at twilight 黄昏时走回家的农民
* Twilight is a dangerous time for drivers. 黎明或黄昏是司机容易出事的时间.
2 the ~ (of sth) (rhet 修辞) period of decreasing importance or strength; decline 衰落时期; 没落
*the twilight of his career 他事业的衰退时期
* [attrib 作定语] his twilight years 他的暮年.

n
[Date: 1400-1500; Origin: twi- 'two, twice' (from Old English) + light]
[U]
the small amount of light in the sky as the day ends
in the twilight
　The end of the cigarette glowed in the twilight.
[U]
the time when day is just starting to become night
= duskat twilight
　romantic walks along the beach at twilight
[singular]
the period just before the end of the most active part of someone's life
twilight of
　in the twilight of her acting career
　Depression in the twilight years (=the last years of your life) is usually related to illness.
twilight world
literary a strange situation involving mystery, dishonesty etc
twilight world of
　the twilight world of espionage