blacken

1. V-T/V-I To blacken something means to make it black or very dark in colour. Something that blackens becomes black or very dark in colour. 使變黑; 變黑

The married women of Shitamachi maintained the custom of blackening their teeth. 下町的已婚婦女保留了染黑牙齒的習俗。

2. V-T If someone blackens your character, they make other people believe that you are a bad person. 詆毀

They're trying to blacken our name. 他們在設法敗壞我們的名聲。