Stack ups, as a term, refers to a tall, organized pile of objects or items, but its antonyms are varied and numerous. Words like scatter, disarray, strewn, and disorganize describe actions that would destroy a stack-up's orderliness. Words like tidy, neaten, and arrange, indicate actions that may improve or organize a stack-up's appearance. Other antonyms may include words like demolish, flatten, and topple, which describe destructive actions that would put an end to any stack-up. There are plenty of antonyms for stack-ups that refer to their disarray or orderliness, but each one describes a specific action that would affect the stack-up in very different ways.