The Collaborative International Dictionary of English v.0.48:
Blur \Blur\ (bl[^u]r), v. t. [imp. & p. p. Blurred (bl[^u]rd);
p. pr. & vb. n. Blurring.] [Prob. of same origin as blear.
1. To render obscure by making the form or outline of
confused and uncertain, as by soiling; to smear; to make
indistinct and confused; as, to blur manuscript by
handling it while damp; to blur the impression of a
woodcut by an excess of ink.
But time hath nothing blurred those lines of favor
Which then he wore. --Shak.
2. To cause imperfection of vision in; to dim; to darken.
Her eyes are blurred with the lightning's glare.
--J. R. Drake.
3. To sully; to stain; to blemish, as reputation.
Sarcasms may eclipse thine own,
But can not blur my lost renown. --Hudibras.
Syn: To spot; blot; disfigure; stain; sully.