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blacken (v.)

c. 1200, "become black or dark;" early 14c., "make black, darken, dye (hair);" see black (adj.) + -en (1). Figurative sense of "to besmirch" (with dishonor, etc.) is from early 15c. Related: Blackened; blackening.

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Definitions of blacken from WordNet

blacken (v.)
make or become black;
The smoke blackened the ceiling
The ceiling blackened
Synonyms: melanize / melanise / black
blacken (v.)
burn slightly and superficially so as to affect color;
The cook blackened the chicken breast
Synonyms: char / sear / scorch
From wordnet.princeton.edu