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English definition of “fall out”

fall out

verb uk phrasal verb with fall   /fɔːl/ us    /fɑːl/ (fell, fallen)

(TOOTH/HAIR)

If a tooth or your hair falls out, it becomes loose and separates from your mouth or head: Her baby teeth are starting to fall out. A side effect of the treatment is that your hair starts to fall out.

(ARGUE)

B2 informal to argue with someone and stop being friendly with them: He left home after falling out with his parents. She'd fallen out with her boyfriend over his ex-girlfriend.

(SOLDIERS)

If soldiers fall out, they move out of a line: "Fall out, men!" shouted the sergeant-major.
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(Definition of fall out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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