verb (used with object), blurred, blur·ring.
- to obscure or sully (something) by smearing or with a smeary substance: The windows were blurred with soot.
- to obscure by making confused in form or outline; make indistinct: The fog blurred the outline of the car.
- to dim the perception or susceptibility of; make dull or insensible: The blow on the head blurred his senses.
verb (used without object), blurred, blur·ring.
- to become indistinct: Everything blurred as she ran.
- to make blurs.
- a smudge or smear that obscures: a blur of smoke.
- a blurred condition; indistinctness: They could see nothing in the foggy blur.
- something seen indistinctly: The ship appeared as a blur against the horizon.
verb blurs, blurring or blurred
- to make or become vague or less distinctheat haze blurs the hills; education blurs class distinctions
- to smear or smudge
- (tr) to make (the judgment, memory, or perception) less clear; dim
- something vague, hazy, or indistinct
- a smear or smudge
1540s, “smear on the surface of writing;” perhaps akin to blear. Extended sense of “confused dimness” is from 1860.
1580s, and thus probably from blur (n.), but the dates are close and either might be the original. Related: Blurred; blurring.