[ 'twʌɪlʌɪt ]
■ noun
1》 the soft glowing light from the sky when the sun is below the horizon, caused by the reflection of the sun's rays by the atmosphere.
2》 a period or state of obscurity or gradual decline: the ~ of his career.
Origin
ME: from OE twi- 'two' (prob. here used in sense 'half-') + light 1 .