When it comes to finding synonyms for the phrase "swift as an arrow," there are plenty of options to choose from. For example, you could say "quick as lightning," "fast as a cheetah," or "rapid as a rocket." Other alternatives might include "speedy as a gazelle," "fleet as a deer," and "hasty as a hare." Whether you're looking for a way to describe a person's movement or the speed of an object, there's a wealth of language at your disposal. So take your time and experiment with different words until you find the perfect way to capture the idea of speed and agility.