BLACK'EN, verb transitive 1. To make black. The importation of slaves that has blackened half America. 2. To make dark; to darken; to cloud. 3. To soil. 4. To sully reputation; to make infamous; as, vice blackens the character. BLACK'EN, verb intransitive To grow black, or dark.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI