When you want to politely tell someone to leave, there are several synonyms for the phrase "go away" that you can use. You can say "please depart," "please vacate the premises," or "kindly retreat." In a more casual context, you can simply say "beat it," "get lost," or "take a hike." There are also more playful ways to tell someone to leave, such as "scram," "shoo," or "buzz off." No matter which synonym you choose, it's important to remember to be respectful and use appropriate language in any situation.