The term "close the deal" refers to the process of finalizing a business agreement, negotiation or transaction. While this phrase is associated with success and accomplishment, there are many antonyms that convey the opposite meaning. Some of these include: fail to reach an agreement, lose the client, fall through, miss the mark, lose out, drop the ball, and leave the matter unresolved. These antonyms represent the complications, misunderstandings, and failures that can arise during the negotiation process. Overall, it is important to understand and avoid these antonyms to achieve successful business agreements and transactions.