blur |blər|
verb ( blurred , blurring )
make or become unclear or less distinct : [ trans. ] tears blurred her vision | his novels blur the boundaries between criticism and fiction | [ intrans. ] as daylight waned, the pages blurred.

noun
a thing that cannot be seen or heard clearly : the pale blur of her face | the words were a blur.
• an indistinct memory or impression of events, typically because they happened very fast : the day before was a blur.

DERIVATIVES
blurry |ˈbləri| adjective ( blurrier, blurriest).

ORIGIN mid 16th cent. (in the sense [smear that partially obscures something)] : perhaps related to blear .