"Mist over" refers to the phenomenon of a thin layer of water droplets settling on a surface, typically visible on windows and mirrors. Synonyms for "mist over" would include "fog up," "steam up," and "condense." These words can be used interchangeably to describe the same effect, and are often used to describe how the temperature and humidity impact visibility. Other synonyms for "mist over" may include "haze up," "blur over," or "cloud over." Regardless of the specific word used, all of these synonyms refer to the process of water droplets forming and gathering on a surface.