Noah Webster's New International Dictionary of the English Language

1. (v.) To make dark or black; to deprive of light; to obscure; as, a darkened room.

2. (v.) To render dim; to deprive of vision.

3. (v.) To cloud, obscure, or perplex; to render less clear or intelligible.

4. (v.) To cast a gloom upon.

5. (v.) To make foul; to sully; to tarnish.

6. (v. i.) To grow or darker.