If worse comes to worst
Meaning: in the worst possible circumstances; if the worst possible thing should happen; if a situation develops in the most unpleasant or difficult way
Example: We should be able to catch the four-thirty train, but if the worst (worse) comes to the worst, we could get a taxi and still get into town on time. Of course, I hope that your wife's health recovers, but if worse comes to worst, I want you to know that we'd be happy to have you stay with us.
Example: We should be able to catch the four-thirty train, but if the worst (worse) comes to the worst, we could get a taxi and still get into town on time. Of course, I hope that your wife's health recovers, but if worse comes to worst, I want you to know that we'd be happy to have you stay with us.