To cause (a lens, camera, or optical device) to be out of focus, producing a blurred image. She unfocused the projector slightly to soften the edges of the picture.
To cause (a person or their attention) to lose concentration. The constant chatter unfocused him during the examination.
To lose focus or clarity; to become blurred or mentally distracted. Her gaze unfocused as she drifted into a daydream.