Dim \Dim\, v. t. [imp. & p. p. Dimmed; p. pr. & vb. n. Dimming.]

1. To render dim, obscure, or dark; to make less bright or distinct; to take away the luster of; to darken; to dull; to obscure; to eclipse.

A king among his courtiers, who dims all his attendants. --Dryden.

Now set the sun, and twilight dimmed the ways. --Cowper.

2. To deprive of distinct vision; to hinder from seeing clearly, either by dazzling or clouding the eyes; to darken the senses or understanding of.

Her starry eyes were dimmed with streaming tears. --C. Pitt.

Source: Webster's Revised Unabridged Dictionary (1913)