The apparent streaking of rapidly moving objects in a still image or a sequence of images such as a movie or animation. It results when the image being recorded changes during the recording of a single frame, either due to rapid movement or long exposure.

plural of motion blur

A visual effect in cinematography or computer graphics that gives the illusion of rapid motion by zooming in or out of a scene and applying blur.

plural of zoom blur

(photography) A feature that prevents blurring of the image.

Alternative form of blur the line.

(idiomatic, often followed by between) To minimize or erode the distinction between two things.