blur

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To make indistinct and hazy in outline or appearance; obscure.
• intransitive verb To make dim, unclear, or cloudy.
• intransitive verb To cause to be intellectually indistinguishable.
• intransitive verb To become visually indistinct.
• intransitive verb To be unclear or clouded.
• intransitive verb To become intellectually indistinguishable.
• noun Something that is hazy and indistinct to the sight or mind.

from The Century Dictionary.

• noun A smudge or smear, such as that made by brushing writing or painting before it is dry; a blot which partially defaces or obscures.
• noun Figuratively, a blot, stain, or injury affecting character, reputation, and the like.
• noun A blurred condition; a dim, confused appearance; indistinctness.
• To obscure or sully (a thing) with something which detracts from its fairness or beauty.
• To sully; stain; blemish: as, to blur one's reputation.
• To obscure without quite effacing; render indistinct; confuse and bedim, as the outlines of a figure.
• To dim the perception or susceptibility of; make dull or insensible to impression: as, blurred eyesight; to blur the judgment.
• To make blurs in writing.

from the GNU version of the Collaborative International Dictionary of English.

• noun That which obscures without effacing; a stain; a blot, as upon paper or other substance.
• noun A dim, confused appearance; indistinctness of vision.
• noun A moral stain or blot.
• transitive verb To render obscure by making the form or outline of confused and uncertain, as by soiling; to smear; to make indistinct and confused.
• transitive verb To cause imperfection of vision in; to dim; to darken.
• transitive verb To sully; to stain; to blemish, as reputation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb To make indistinct or hazy, to obscure or dim.
• verb To smear, stain or smudge.
• verb intransitive To become indistinct.
• noun A smear, smudge or blot
• noun Something that appears hazy or indistinct
• noun obsolete A moral stain or blot.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a hazy or indistinct representation
• verb become vague or indistinct
• verb make unclear, indistinct, or blurred
• verb make dim or indistinct
• verb make a smudge on; soil by smudging
• verb to make less distinct or clear
• verb become glassy; lose clear vision