There are a number of different synonyms for the phrase "pass away," each of which can be used to convey a slightly different sense of meaning or atmosphere. Some common synonyms might include phrases like "expire," "depart," "move on," "cross over," "transition," or "leave this world." Each of these phrases has its own connotation and nuance, ranging from the more formal and distant tone of "expire" to the more poetic and metaphorical imagery of "cross over" or "transition." Ultimately, the choice of synonym depends on the specific needs of the speaker or writer, as well as the audience they're speaking to.