1. Something which cannot be seen clearly: The letters and words are just blurs when Mary looks at them without her glasses.

When the train was speeding on, everything outside the window became one continual blur.

2. Anything that is difficult to remember: The whole day has been a blur for Ernie because he doesn't remember clearly what happened after he had fallen down and hit his head against a tree in the morning.

Making something unclear or difficult to see or to remember: The tears in Salina's eyes blurred the words on the page of the book that she was trying to read.

Although her novel is based on historical happenings, it blurs the distinctions between fact and fiction.