There are many synonyms for the phrase "fell apart," which are often used to describe situations or objects that have deteriorated or broken down. Some possible alternatives include "broke down," "crumbled," "disintegrated," "collapsed," "failed," "dissolved," "fragmented," "splintered," "shattered," "burst," "ripped apart," "came apart at the seams," and "went to pieces." Depending on the context, each of these phrases might be more or less appropriate for conveying the extent of the damage or decline that has occurred. Regardless of the specific words used, however, the underlying message is usually one of loss, collapse, or disintegration.