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