[transitive, intransitive] blacken (something) to make something black; to become black Their faces were blackened with soot. Smoke had blackened the walls. rows of blackened teeth There was a row of brick houses, blackened by smoke.
blacken verb definition in Waste and pollution topic from the Oxford Advanced Learner's Dictionary
Explore synonyms and entries related to Waste and pollution
Explore other topic groups related to Waste and pollution