1V-ERG (使)变黑;弄黑;涂黑 To blacken something means to make it black or very dark in colour. Something that blackens becomes black or very dark in colour. (使)变黑;弄黑;涂黑
The married women of Shitamachi maintained the custom of blackening their teeth. [VERB noun]
下町的已婚女性还保留着把牙齿涂黑的习俗。
You need to grill the tomatoes until the skins blacken. [VERB]
你得把番茄烤到皮变黑为止。
2VERB 诬蔑;玷污;给…抹黑 If someone blackens your character, they make other people believe that you are a bad person. 诬蔑;玷污;给…抹黑
He accused him of knowingly spreading falsehoods in an effort to blacken my character. [VERB noun]