godan verb (-ru), intransitive verb
rise to a high position; work one's way up; climb the ladder
Implies effort, ambition, or pushing through obstacles to reach a higher social or professional rank. Often used in career contexts.
彼は努力して社長にのし上がった。
He worked his way up to become company president.
政界でのし上がるにはコネが必
It's said that connections are necessary to rise in the political world.