Etymology
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blur (n.)

1540s, "a moral stain;" c. 1600, "a smear on the surface of writing;" perhaps akin to blear. Extended sense of "a confused dimness" is from 1860 [Emerson, in reference to the Orion nebula].

blur (v.)

1580s, "blot out by smearing ink over," probably from blur (n.), but the dates are close and either might be the original. From 1610s as "obscure without defacing," also "dim the perception of." From 1856 in intransitive sense "become blurred." Related: Blurred; blurring.

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Definitions of blur
1
blur (v.)
become glassy; lose clear vision;
Synonyms: film over / glaze over
blur (v.)
to make less distinct or clear;
The haze blurs the hills
blur (v.)
make unclear, indistinct, or blurred;
Synonyms: confuse / obscure / obnubilate
blur (v.)
make a smudge on; soil by smudging;
Synonyms: smear / smudge / smutch
blur (v.)
make dim or indistinct;
The fog blurs my vision
Synonyms: blear
blur (v.)
become vague or indistinct;
The distinction between the two theories blurred
Synonyms: dim / slur
2
blur (n.)
a hazy or indistinct representation;
it happened so fast it was just a blur
Synonyms: fuzz
From wordnet.princeton.edu