The crossword solution for the term BLUR BY RUBBING is SMEAR. Smearing is a technique used to blur an image or artwork by rubbing it with a tool such as a cloth, brush, or finger. This technique is often used in painting and photography to create a soft, hazy effect. It can also be used to create a smudged look on paper or canvas. Smearing is a popular technique among artists because it allows them to create a unique look that cannot be achieved with other methods.