"darkening" in the noun sense
1. blackening, darkening
changing to a darker color
"darkening" 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"
"darkening" in the adjective sense
1. darkening
becoming dark or darker as from waning light or clouding over
"the darkening sky"
Source: WordNet® (An amazing lexical database of English)
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