There are various synonyms for the phrase "become dilapidated out," which refers to something that has fallen into a state of disrepair or decay. Some potential synonyms include "deteriorate," "crumble," "disintegrate," "wear out," "decay," "rot," "degenerate," "decline," "decompose," "break down," "go to pieces," and "fall apart." These terms all describe the gradual process of losing structural integrity, functionality, or aesthetic appeal over time. Whether referring to buildings, roads, vehicles, or other objects, "become dilapidated out" is a common phrase to describe the gradual loss of quality or value that often accompanies extended use or neglect.