When things fall apart, we often say that they have come/go to pieces. It means that something or someone has broken down, failed, or deteriorated completely. Instead of using this phrase repeatedly, here are some synonyms that you can use to express the same idea: disintegrate, crumble, collapse, break down, fall apart, disassemble, fragment, splinter, shatter, unravel, undo, and disarray. Each of these synonyms conveys the idea of an object or situation that has lost its original form or structure. You can use these words interchangeably to add variety to your writing and avoid repeating the same phrase.