0 If a tooth or your hair falls out, it becomes loose and separates from your mouth or head: --
1 to argue with someone and stop being friendly with them: --
2 If soldiers fall out, they move out of a line: --
"Fall out, men!" shouted the sergeant-major.
3 (of an object) to drop from a place where it was attached or contained: --
4 to have an argument or disagreement that ends a relationship: --