Fall Out Meaning

(figuratively) To leave one's current location to report for duty at a new location.

Example:   I opened the cupboard and a can fell out on to my foot.
  Dave and I fell out after a long argument.
2011 December 14, Steven Morris, “Devon woman jailed for 168 days for killing kitten in microwave”[1], Guardian:
  Before the incident Robins had fallen out with Knutton, 30. Knutton had made a complaint over Robins' boyfriend.
  The company fell out for an artillery drill.