The word "be-cloud" means to obscure or darken, but there are several antonyms that can be used to describe the opposite effect. One antonym is "clear", which means to make something transparent or remove any visual obstruction. Another antonym is "illuminate", which means to light up or make something bright. A third antonym is "clarify", which means to make an idea or concept easier to understand. Lastly, the antonym "brighten" can be used to describe the act of making something lighter or more cheerful. By using these antonyms, one can effectively communicate the opposite effect of "be-clouding".