"Chase a rabbit" is a phrase commonly used to describe someone who is easily distracted or going off on tangents. There are several synonyms that can be used to convey this meaning, such as "run after a wild goose," "follow a red herring," or "chase after shadows." These expressions emphasize the idea of pursuing something that is elusive or unlikely to provide any real benefit. Other similar phrases include "go down a rabbit hole," "chase your tail," or "get sidetracked." No matter which phrase you use, the underlying message is clear - the person in question is not focusing on what truly matters and is wasting time and energy on fruitless endeavors.