There are many synonyms for the phrase "in stitches," which refers to someone who is laughing uncontrollably. Some of these synonyms include "cracking up," "rolling on the floor," and "busting a gut." Other options include "hysterical," "roaring with laughter," and "in hysterics." When you describe someone as being in stitches, it typically means something has really tickled their funny bone, and they're finding it hard to stop laughing. Whether it's a joke, a funny story, or a humorous situation, being in stitches is a great feeling that we all enjoy from time to time.