The phrase "worse comes to worst" (or sometimes "worst comes to worst") is an idiom used to express a situation where things are already bad, and one is considering what might happen if the situation deteriorates further.
It's often used when discussing contingency plans or considering the most extreme or unfavorable outcome.
For example, if someone is discussing a difficult financial situation, they might say, "If I lose my job, and my savings run out, worse comes to worst, I might have to sell my house."
In this context, "worse comes to worst" suggests that the speaker is thinking about the worst possible outcome in a series of unfortunate events.
The phrase is similar in meaning to "if all else fails" or "in the worst-case scenario." It's a way of acknowledging that things are already bad, but there's a recognition that they could potentially get even worse.