Possible Definitions:
1. Darken (a.) To make dark or black; to deprive of light; to obscure; as, a darkened room.
2. Darken (a.) To render dim; to deprive of vision.
3. Darken (a.) To cloud, obscure, or perplex; to render less clear or intelligible.
4. Darken (a.) To cast a gloom upon.
5. Darken (a.) To make foul; to sully; to tarnish.
6. Darken (v. i.) To grow or darker.