The term "letting for" refers to allowing someone to take possession of something, usually for a temporary or permanent period. The antonyms for "letting for" would include: refusing, denying, withholding, retaining, keeping, or holding onto. For instance, if you decide to refuse someone from taking possession of your bike, you are not "letting for" them. Similarly, if you plan to withhold a book from someone, you would not be "letting for" them. In essence, antonyms serve as opposites and are relevant in conversational, written, and professional settings. It is essential to understand antonyms to effectively communicate and express oneself comprehensively.