Clouding

To become foggy or gloomy, or obscured from sight.

"The glass clouds when you breathe on it."

To overspread or hide with a cloud or clouds.

"The sky is clouded."

To make obscure.

"All this talk about human rights is clouding the real issue."

To make less acute or perceptive.

"The tears began to well up and cloud my vision."

A cloudy appearance.

A mottled appearance given to ribbons and silks in the process of dyeing.

A diversity of colours in yarn, recurring at regular intervals.