Definitions for overcloudˌoʊ vərˈklaʊd
Random House Webster's College Dictionary
to overspread with or as if with clouds.
to make gloomy.
Origin of overcloud:
overcloud, cloud over, cloud up(verb)
become covered with clouds
"The sky clouded over"
obscure, bedim, overcloud(verb)
make obscure or unclear
"The distinction was obscured"
To cover, or become covered, with clouds