To come out of something by falling.
To leave one's place in the current formation of ranks in order to take one's place in a new formation.
To leave one's current location to report for duty at a new location.
To pass out.
To cease to be on friendly terms.
Synonym of falling out (“rift following a disagreement or quarrel”)
To encounter by chance.
To do or occur by chance or unexpectedly.
To occur or take place.