What is the meaning of fall apart?

verb

• Lose one's emotional or mental composure.
  • usage: "She fell apart when her only child died"
  • synonyms: go to pieces
• Go to pieces.
  • usage: "The lawn mower finally broke"; "The gears wore out"; "The old chair finally fell apart completely"
  • synonyms: break, wear, wear out, bust
• Break or fall apart into fragments.
  • usage: "The cookies crumbled"; "The Sphinx is crumbling"
  • synonyms: crumble
• Become separated into pieces or fragments.
  • usage: "The figurine broke"; "The freshly baked loaf fell apart"
  • synonyms: break, separate, split up, come apart