Decumulate, meaning to reduce or dispose of accumulated items, can be replaced with a variety of synonyms that convey the same idea. One such synonym is "disperse", which implies spreading out or scattering accumulated things. Another substitute could be "distribute", suggesting the act of sharing or allocating accumulated objects among different individuals or places. Additionally, "liquidate" can be used when referring to selling or converting accumulated assets into cash. Similarly, "unload" expresses the idea of getting rid of accumulated items by selling or removing them. Lastly, "shed" can be employed to indicate the process of gradually getting rid of accumulated materials or ideas.