We don't have any synonyms for come undone yet.
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Definition of come undone:
(v) :
(figurative) To come to ruin, to fail; to lose one's composure or self-control.
(v) :
(colloquial) To become disintegrated, to break into parts or pieces.
(v) :
Used other than figuratively or idiomatically: see come, undone; to become undone or unfastened.