"Un due" is an Italian phrase that translates to "one two" in English. When searching for synonyms, one can look for words that convey similar meanings such as "pair," "couple," or "duo." Other related terms include "tandem," "partners," or "twosome." Depending on the context, one could also use words like "match," "set," or "team" to describe the idea of two things coming together or working in unison. "Un due" can have different connotations depending on the context, so it's important to choose the right synonym to accurately convey the intended meaning.