Definition of fall out phrasal verb from the Oxford Advanced American Dictionary

 

fall out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to become loose and drop His hair is falling out. My tooth fell out.
  2. 2if soldiers fall out, they leave their lines and move away

fall out (with somebody)

 
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to have an argument with someone so that you are not friendly with them anymore
See the Oxford Advanced Learner's Dictionary entry: fall out