falling-out       
noun [ S ]  informal uk/ˌfɔː.lɪŋˈaʊt/ us/ˌfɑː.lɪŋˈaʊt/
 争吵
an argument
  Rachel and Fi had a falling-out and now they're not speaking to each other. 雷切尔和菲吵了一架,现在互不理睬了。 
 
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