The term 'Do a Cobbler's Job' refers to the work of a shoemaker or cobbler, which includes three main tasks: Reheel, Resole, and Relast. Reheeling involves replacing the worn-out heel of a shoe with a new one. Resoling involves replacing the sole of a shoe with a new one. Relasting involves reshaping the last of a shoe, which is the form used to shape the shoe during the manufacturing process.