The word "expend" means to use up resources, such as money, time or energy. Antonyms for this word include "conserve," "save" and "hoard." The opposite of "expend" is to maintain, preserve or hold on to something without using it up. For example, in the case of money, an individual may choose to conserve it by not spending it on unnecessary items. Alternatively, time can be saved by not wasting it on trivial tasks. In short, antonyms for "expend" pertain to a conscious effort to hold on to something and not use it up unnecessarily.