blur - definition and synonyms

noun [countable] [usually singular] 

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  1. 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

     Synonyms and related words
  2. 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.