The term "buys up" can be defined as purchasing large amounts of a particular product or commodities. The antonyms of buys up are disperses, sells, and divests. Disperses means scattered or spread out, meaning the opposite of buying up. Selling is the opposite of buying, which means one party transfers ownership to another party. Divest means to sell off a particular asset or investment. Therefore, the opposite of buying up is to sell, to disperse or divest. These antonyms imply a reduction in the holding of a particular product, rather than an accumulation.