The phrase 'be in ferment' is typically used to describe a situation or event that is full of excitement, activity, or change. Synonyms for this phrase might include 'be in flux', 'be in upheaval', 'be in turmoil', or 'be in a state of flux'. Other options might include 'be in a state of unrest', 'be in a state of agitation', 'be in a state of revolution', or 'be in a state of ferment'. All of these phrases suggest a situation that is in motion, with people or events coming together to create something new and exciting. Whether it's a political revolution, a scientific discovery, or a cultural moment, these synonyms all capture the energy and vitality of being in ferment.