- 1[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
- 2[transitive] blacken someone's name/reputation/character to say unpleasant things that give people a bad opinion of someone He accused the newspaper of trying to blacken his name.
NAmE//ˈblækən//Verb Forms present simple I / you / we / they blacken
he / she / it blackens
past simple blackened
-ing form blackening