To "tower" over all other things. Tower as a noun meaning a tall building, structure, or monument. The verb form would mean the state of being taller than something, or greater than something.
An adult towers over a small child. A skyscraper towers over a restaurant. A celebrity's fame could tower in comparison to an average person. A tall stack of paper money (dollar bills) could tower over a small pile of coins.
It's more about the height of a thing, and the feeling of it making something else feel small either emotionally or physically.