Webster's Revised Unabridged Dictionary · 1913

Darken

Darken (dark"'n) , transitive verb

[Anglo-Saxon deorcian. See Dark, a.]

1.
To make dark or black; to deprive of light; to obscure; as, a darkened room.
They [locusts] covered the face of the whole earth, so that the land was darkened. — Ex. x. 15
So spake the Sovran Voice; and clouds began To darken all the hill. — Milton
2.
To render dim; to deprive of vision.
Let their eyes be darkened, that they may not see. — Rom. xi. 10
3.
To cloud, obscure, or perplex; to render less clear or intelligible.
Such was his wisdom that his confidence did seldom darkenhis foresight. — Bacon
Who is this that darkeneth counsel by words without knowledge? — Job. xxxviii. 2
4.
To cast a gloom upon.
With these forced thoughts, I prithee, darken not The mirth of the feast. — Shakespeare
5.
To make foul; to sully; to tarnish.
I must not think there are Evils enough to darken all his goodness. — Shakespeare

Darken , intransitive verb

To grow or darker.