"darkens" in the verb sense
1. darken
become dark or darker
"The sky darkened"
2. darken
tarnish or stain
"a scandal that darkened the family's good name"
3. darken
make dark or darker
"darken a room"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License