Meaning : Have a breach in relations.
We fell out over a trivial question.
Meaning : Come as a logical consequence. Follow logically.
It follows that your assertion is false.
The theorem falls out nicely.
Synonyms : follow
Meaning : Come off.
His hair and teeth fell out.
Synonyms : come out
Meaning : Leave (a barracks) in order to take a place in a military formation, or leave a military formation.
The soldiers fell out.