fall apart phrasal verb ( see also ↑ fall )
1 . if an organization, system, relationship etc falls apart, it stops being effective or successful:
Don’t be reckless or your plans may fall apart.
The health service is falling apart at the seams.
2 . be falling apart to be in very bad condition:
Tommy’s old bicycle was rusty and falling apart.
3 . to break into pieces:
The book fell apart in my hands.
4 . to be unable to deal with your personal or emotional problems:
She had to get some rest or she was going to fall apart.
5 . sb’s world/life falls apart if someone’s world or life falls apart, something very bad and serious happens which changes their life:
When his wife left him, his world fell apart.