When you find yourself in an extreme situation, sometimes the only option left is to resort to the final alternative. However, there are other ways to describe this "most last resort". One might call it a "last-ditch effort", a "desperate measure" or a "final gamble". It could also be described as a "Hail Mary pass", a "long shot", or a "hope against hope". Other synonyms for the phrase might include "ultimate choice", "end-all-be-all", or "final recourse". No matter what term is used to describe it, the "most last resort" should only be utilized when all other options have been exhausted.