Cloud

A rock; boulder; a hill.

A visible mass of water droplets suspended in the air.

Any mass of dust, steam or smoke resembling such a mass.

Anything which makes things foggy or gloomy.

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."