The antonyms for the word "Preorder" are "Cancel", "Return", "Abandon", "Reject", "Discontinue", "Postpone", "Neglect", "Ignore", and "Disavow". These words have the opposite meaning of "Preorder", which means to order a product in advance before it is released in the market. Cancel means to withdraw an order that has been placed. Return means to give back the purchased product. Abandon means to relinquish the intention or desire to buy a product. Reject means to refuse to buy or accept a product. Discontinue means to stop offering a product for sale. Postpone means to delay the purchase of a product. Neglect means to fail to order a product, and Disavow means to disclaim the order of the product.