There are several synonyms for the phrase "be about to do something". Some common alternatives include "on the verge of", "about to", "just about to", "on the point of", "nearly ready to", and "close to". These phrases indicate a sense of imminent action or preparation for an activity. They are often used in a variety of contexts, including work, school, or social situations. Regardless of the specific synonym used, the intention is to convey the sense that an action is about to take place or is very close to happening.