なりあがる

成り上がる
to rise (suddenly) in the world (to a higher position)

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なりあがる【成り上がる】

〔出世する〕 (suddenly) rise to a higher position [greater prominence]; rise (suddenly) in the world; 〔卑しい身分から〕 rise from the ranks [gutter]; work one's way up 《to…》; 〔成金になる〕 become suddenly rich.

●一介のバイト学生が大企業の社長に成り上がった. A mere student working part-time rose to become the president of a major corporation.

・彼女は場末の芸人から銀幕の大スターに成り上がった. She rose from back-street entertainer to become a big star of the silver screen.

・彼は社会の底辺から成り上がった. He has worked his way up from the bottom.