The phrase "be clouds" is a figurative expression that refers to obscuring or casting a shadow over something. Synonyms for this phrase include obscure, veil, shroud, cloak, cover, eclipse, overshadow, and darken. These words can be used to describe different levels of obstruction or concealment, from a partial or temporary obstruction to a complete or permanent covering. Depending on the context, these synonyms can also convey a sense of mystery, intrigue, or foreboding. When writing or speaking, it's important to choose the right synonym that accurately conveys the intended meaning and creates the desired impact on the audience.