Go from bad to worse
Definition 1 of 1
Pro Tip 1/3Negative Progression
Used to describe a situation that is getting progressively worse, not just a one-time event. 
His grades went from bad to worse last semester.
Pro Tip 2/3Not Literal
Sometimes used figuratively to emphasize a decline in quality, not necessarily from bad to the worst possible. 
After the lead actor left, the show went from bad to worse.
Pro Tip 3/3Emphasizing Trouble
Can be used to stress how troubling or difficult a situation is becoming. 
When they lost their map, their trip went from bad to worse.