When you're in a rush and need to leave quickly, the phrase "hast to go" may come to mind. However, there are plenty of synonyms or similar expressions you can use instead. For instance, you might say you "need to hurry off," "need to dash," or "need to make a quick exit." Other options could include saying you "must be on your way," "have to leave," or "gotta run." Whether you're trying to catch a train or just running late for an appointment, there are plenty of ways to express the need to leave quickly and urgently.