When it comes to antonyms for "begin business," there are several possibilities. First, you could simply use the opposite verbs "end" or "stop" instead of "begin." Other possible antonyms include "exit," "withdraw," or "retreat" if you mean to cease operations altogether. On the other hand, if you want to express a lack of action or initiative, you might use antonyms such as "idle," "procrastinate," or "neglect." Finally, if you wish to indicate a shift away from traditional business practices, you could use antonyms like "relinquish," "abandon," or "divest." Ultimately, the most appropriate antonym will depend on the context and intended meaning of the phrase.