When things go wrong and plans fall apart, we often use the phrase "comes unstuck" to describe the situation. However, this phrase can get repetitive after a while. So, if you need some synonyms to spice up your conversations or writing, here are a few options: falls apart, unravels, collapses, disintegrates, crumbles, shatters, fails, breaks down, disintegrates, goes awry, derails, or flounders. Each of these alternatives conveys a sense of something falling apart or failing to come together, allowing you to express yourself in a more varied and nuanced way.