Definition of fall out phrasal verb from the Oxford Advanced Learner's 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 somebody so that you are no longer friendly with them
See the Oxford Advanced American Dictionary entry: fall out