dark ‧ en /ˈdɑːkən $ ˈdɑːr-/ BrE AmE verb
[ Word Family: adjective : ↑ dark , darkened, darkening; noun : ↑ dark , ↑ darkness ; verb : ↑ darken ; adverb : ↑ darkly ]
1 . [intransitive and transitive] to become dark, or to make something dark:
The sky darkened and a few drops of rain fell.
a darkened theater
The evening shadows darkened the room.
2 . [intransitive and transitive] to become less hopeful or positive, or to make something like this:
As he got drunker, his mood darkened.
3 . [intransitive] if someone’s face darkens, they start to look angry:
The captain’s face darkened as he read.
4 . never darken my door again old-fashioned said when you do not want to see someone again – now used humorously