blur

I UK [blɜː(r)] / US [blɜr] verb [intransitive/transitive]
Word forms "blur":
present tense I/you/we/they blur he/she/it blurs present participle blurring past tense blurred past participle blurred

1) if a thing blurs, or if something blurs it, it becomes difficult to see it clearly, often because its edges are not clear

With eyesight as poor as mine, faces blur into featureless ovals.

The paper had got wet and blurred the ink.

2) if the difference between two things blurs, or if something blurs it, they become more similar, so that you are no longer sure that they are clearly different

blur the line/difference/distinction between:

Their adverts blur the line between art and advertising.

3) if something such as a memory or an idea has blurred, or if something has blurred it, it is no longer clear in your mind

Childhood recollections had blurred into a mix of reality and fantasy.

II UK [blɜː(r)] / US [blɜr] noun [countable, usually singular]
Word forms "blur":
singular blur plural blurs

1) a shape that is difficult to see clearly, for example because it is moving very fast

in a blur:

The racing cars moved past us in a blur.

blur of:

a blur of activity/movement

2) something such as a thought or memory that is not very clear in your mind

I remember a big house, but the rest of it is just a blur.