"Be in business" is a common phrase used to indicate that someone is running a business or has commenced operations. However, there are a number of synonyms that can be used to describe the same state of affairs. For instance, the phrase "run a business" is identical in meaning, as is "operate a business." Additionally, one might say that they are "established in business" or "conducting business." "Engaged in business" is another possible construction, as is "doing business." All of these alternatives can be used to convey the same idea as "be in business," and can be employed to vary one's language and avoid repetition.