self-fulfilling prophecy      
noun [ C ] uk/ˌself.fʊlˌfɪl.ɪŋ ˈprɒf.ə.si/ us/ˌself.fʊlˌfɪl.ɪŋ ˈprɑː.fə.si/
 会应验的预言
something that you cause to happen by saying and expecting that it will happen
 
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