Definitions from Wiktionary (fall out)

▸ noun:  Synonym of falling out (“rift following a disagreement or quarrel”)
▸ verb:  (literally) To come out of something by falling.
▸ verb:  (intransitive, idiomatic) To cease to be on friendly terms.
▸ verb:  (military, intransitive, literally) To leave one's place in the current formation of ranks in order to take one's place in a new formation.
▸ verb:  (military, intransitive, figuratively) To leave one's current location to report for duty at a new location.
▸ verb:  (dialect, intransitive) To pass out.
▸ verb:  (dated) To turn out, happen.
▸ verb:  (intransitive, obsolete, printing, of type) To fall off due to the quoins holding it in place having become wet and therefore loose.
▸ verb:  (intransitive, Of a trapdoor or similar) To give way under someone.
▸ verb:  (intransitive, Of the ground, floor, snow, etc., or figuratively, a worldview or foundation) To cause someone to slip and/or fall down.
▸ verb:  (intransitive, slang) To be enthusiastic about something; to laugh very hard.
▸ verb:  (intransitive, slang) To depart.
▸ verb:  (intransitive, slang, African-American Vernacular) To collapse; to pass out from intoxication.
▸ verb:  (intransitive, slang, African-American Vernacular) To be shocked by something.

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