Synonyms:
clouding, clouding_up
Meaning: the process whereby water particles become visible in the sky
Usage examples
I did not ask her to tell me, nor did I ask myself, the reason of that change; and afterwards how often I noticed that same change in her, and in the others too--that sudden silence and clouding of the face, such as may be seen in one who freely expresses himself to a person who cannot hear, and then, all at once but too late, remembers the other's infirmity.