What is the meaning of falling out?

noun

• A personal or social separation (as between opposing factions. )
  • usage: "they hoped to avoid a break in relations"
  • synonyms: rupture, breach, break, severance, rift

verb

• Have a breach in relations.
  • usage: "We fell out over a trivial question"
  • synonyms: fall out
• Come as a logical consequence; follow logically.
  • usage: "It follows that your assertion is false"; "the theorem falls out nicely"
  • synonyms: follow, fall out
• Come off.
  • usage: "His hair and teeth fell out"
  • synonyms: come out, fall out
• Leave (a barracks) in order to take a place in a military formation, or leave a military formation.
  • usage: "the soldiers fell out"
  • synonyms: fall out
• Come to pass.
  • usage: "What is happening"; "The meeting took place off without an incidence"; "Nothing occurred that seemed important"
  • synonyms: happen, hap, go on, pass off, occur, pass, fall out, come about, take place