Marks down refers to a reduction in the price of a product or service. Antonyms for marks down include marks up, increases, raises, and hikes. These words suggest an increase in price instead of a decrease. When a company decides to marks up their products, it means they are increasing the price to make a profit or cover their costs. An increase in price could be due to inflation, high demand, or limited supply. On the other hand, an increase in price could also suggest that the product or service is of high quality or comes with additional benefits.