(1):
(v. i.) To grow dim.
(2):
(v. t.) 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.
(3):
(superl.) Of obscure vision; not seeing clearly; hence, dull of apprehension; of weak perception; obtuse.
(4):
(v. t.) To deprive of distinct vision; to hinder from seeing clearly, either by dazzling or clouding the eyes; to darken the senses or understanding of.
(5):
(superl.) Not bright or distinct; wanting luminousness or clearness; obscure in luster or sound; dusky; darkish; obscure; indistinct; overcast; tarnished.