vi to grow or darker.
2. darken ·adj to cast a gloom upon.
3. darken ·adj to render dim; to deprive of vision.
4. darken ·adj to cloud, obscure, or perplex; to render less clear or intelligible.
5. darken ·adj to make foul; to sully; to tarnish.
6. darken ·adj to make dark or black; to deprive of light; to obscure; as, a darkened room.