sunset

 /ˈsʌn.set/

[U] the time in the evening when you last see the sun in the sky:

The fishermen set out at sunset for a night's fishing.

​[U] the time when the sun goes down and night begins

• at sunset Every evening at sunset the flag was lowered.

[C] the colours in the part of the sky where the sun slowly goes down in the evening

• a spectacular sunset