Meaning of DARK in English

DARK

[noun] [U]If you eat carrots does it really help you to see in the dark?I've always been afraid of the dark.It isn't safe to leave the house after dark (= after the sun has gone down).I want to be home before dark.(figurative) I'm amazed to hear they're getting a divorce, I was completely in the dark (= I knew nothing) about their problems.

Cambridge English vocab.      Кембриджский английский словарь.