The phrase "gotten bottom" usually means reaching the lowest point or achieving the worst possible outcome. However, there are several synonyms that can be used to convey the same meaning. Some of these synonyms include "reached rock bottom," "hit the floor," "reached the nadir," "reached the depths," and "sunk to the lowest level." Other words that can be used in place of "gotten bottom" to express a similar idea are "plunged," "descended," "dropped," "fallen," and "crashed." These different synonyms can be used interchangeably to add variety and nuance to one's vocabulary and help to avoid repetition in writing or speaking.