There are a few words and phrases that can be used as synonyms for the phrase "hit bottom." One such phrase is "hit rock bottom," which means to reach the lowest point possible. Another phrase that can be used is "reach a nadir," which refers to the lowest point of something. Some other words that can be used as synonyms for "hit bottom" include collapse, decline, and deterioration. Additionally, phrases such as "reach the end of one's rope" or "hit a dead end" can also convey the same meaning. Regardless of which synonym one chooses to use, the overall idea remains the same - to reach the lowest point possible.