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English definition of “blacken”

blacken

verb     /ˈblækən/
DARK [I, T] to become black or to make something become black : Storm clouds blackened the sky .Black, white and grey
BAD [T] If you blacken someone's name , you say bad things about them.Damaging reputationDisapproving and criticizing
(Definition of blacken verb from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “blacken” in other dictionaries

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