The antonyms for the phrase "close deal" include "fail to complete," "open-ended discussion" and "unfinished negotiation." These phrases convey the opposite meaning of concluding a business transaction, indicating that the talks have fallen through or are still ongoing. Other antonyms of "close deal" include "walk away," "abandon negotiations," or "disengage." In business, it is essential to know how to negotiate and conclude deals effectively. However, sometimes, it may be better to walk away than to force a deal that is not in one's best interest. Understanding the antonyms of "close deal" can help individuals make informed decisions when negotiating a business transaction.