BLACKENING
blackening, darkening
(noun) changing to a darker color
Source: WordNet® 3.1
Verb
blackening
present participle of blacken
Noun
blackening (plural blackenings)
The act of turning black in colour; a black stain or mark.
Source: Wiktionary
BLACKEN
Black"en, v. t. [imp. & p. p. Blackened; p. pr. & vb. n. Blackening.]
Etym: [See Black, a., and cf. Black, v. t. ]
1. To make or render black.
While the long funerals blacken all the way. Pope
2. To make dark; to darken; to cloud. "Blackened the whole heavens."
South.
3. To defame; to sully, as reputation; to make infamous; as, vice
blackens the character.
Syn.
– To denigrate; defame; vilify; slander; calumniate; traduce;
malign; asperse.
Black"en, v. i.
Definition: To grow black or dark.
Source: Webster’s Unabridged Dictionary 1913 Edition