fall out
fall out {v.}
1. To happen.
As it fell out, the Harpers were able to sell their old car.
Compare: TURN OUT (6).
2. To quarrel; fight; fuss; disagree.
The thieves fell out over the division of the loot.
3. To leave a military formation.
You men are dismissed. Fall out!
Contrast: FALL IN.
4. To leave a building to go and line up.
The soldiers fell out of the barracks for inspection.
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Source: A Dictionary of American Idioms