Definitions of blacken

1. To make or become black; darken; defame.

2. To make dark; to darken; to cloud.

3. To make black; to soil; to speak evil of, as of the character or reputation.

4. To make black: to defame.

5. To grow black or dark.

6. make or become black; " The smoke blackened the ceiling"; " The ceiling blackened"

7. To make black; to darken; to sully; to make infamous.

8. To make black; to soil; to defame.