The difference between Come undone and Fall apart
When used as verbs, come undone means to become disintegrated, to break into parts or pieces, whereas fall apart means to disintegrate.
check bellow for the other definitions of Come undone and Fall apart
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Come undone as a verb (colloquial):
to become disintegrated, to break into parts or pieces.
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Fall apart as a verb (intransitive):
To disintegrate.
Examples:
"My old briefcase is falling apart. I'll have to buy a new one."
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Fall apart as a verb (idiomatic):
To be emotionally in crisis.
Examples:
"As a result of being addicted to heroin, she was falling apart."