1. When the sky darkens, the lights dim and the clamor mounts.
2. Thunder and lightening appear as the stage darkens and applause erupts in the big hall.
3. The set is speared by a brilliant full moon as it darkens at the end of each act.
4. Your mood darkens somewhat today, though that isn't always a bad thing.
5. The picture also darkens in consideration of those broadly classified as likely to be " dependent, " that is under the age of 15 and above 65.