"Run along!" is a phrase that's often used to dismiss someone or encourage them to leave. However, it may be useful to use similar expressions to avoid sounding rude or impolite. Here are some synonyms for "run along!": "scram!", "shoo!", "go away!", "get lost!", "move along!", "hit the road!", "take a hike!", "buzz off!", "skedaddle!", "scat!", "beat it!", and "vamoose!". These phrases all imply that someone is being asked to leave, but some may be more appropriate in certain contexts than others. Overall, using synonyms for "run along!" can help convey the message without sounding too harsh.