1. move up through a company's employment hierarchy
climb/move up the ladder in work
To climb or move up the ladder means to advance in some way through an established system. You might 'climb up the ladder' of a company or organisation, meaning to progress through the ranks to move higher and higher in position. "I hope this night course will help me move up the ladder at work." - in this sentence the speaker is hoping the course they are doing might earn them a promotion. This is an idiomatic expression used in social and professional contexts.