Blacken and Clouding up

Blacken verb - To make dirty.

Clouding up and blacken are semantically related In some cases you can replace phrase "Clouding up" with "Blacken", this terms are similar.

Nearby Words: black, blackness, blacking, blackening, blacked

Clouding up noun - The process whereby water particles become visible in the sky.

Blacken and clouding up are semantically related in unlit topic. You can use "Blacken" instead a verb phrase "Clouding up", if it concerns topics such as shut out the light.