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.
To cause imperfection of vision in; to dim; to darken.
To sully; to stain; to blemish, as reputation.
That which obscures without effacing; a stain; a blot, as upon paper or other substance.
A dim, confused appearance; indistinctness of vision; as, to see things with a blur; it was all blur.
I like to see the difference between good and evil as kind of like the foul line at a baseball game. It's very thin, it's made of something very flimsy like lime, and if you cross it, it really starts to blur where fair becomes foul and foul becomes fair. Harlan Coben