The phrase "waste on case" refers to an effort or action that is futile or meaningless. Some synonyms for this phrase include: useless, fruitless, unproductive, pointless, ineffective, and unsuccessful. These words all convey the same idea, that something is being done without any real purpose or benefit. Other similar phrases might include "wasting time" or "spinning one's wheels." It's important to recognize when we are engaging in actions that are ultimately wasteful or counterproductive, so that we can redirect our efforts towards more meaningful and productive pursuits.