Definitions of blurring
the act of making something less clear
Each license granted is subject to immediate termination in the event that the party granting the license believes that the other party is, in any way, diminishing, diluting or blurring the value of the Licensed Property.
when the distinctiveness of a famous trademark is weakened by association with another similar trademark
In South America, blurring of a mark diminishes the value of the trademark in the market and can also be considered unfair competition.