johnny-come-lately
noun [ C ] disapproving uk/ˌdʒɒn.i.kʌmˈleɪt.li/ us/ˌdʒɑː.ni.kʌmˈleɪt.li/ johnny-come-latelies or johnnies-come-lately
后来者;一夜成名者;新贵
someone who has only recently started a job or activity and has suddenly become very successful