The phrase "hadst nose grindstone" is an old idiom that means to be working hard and concentrating on a difficult task. If you're tired of using the same expression, there are plenty of synonyms to choose from that will add some variety to your writing or conversation. Some potential alternatives to "hadst nose grindstone" include "putting your nose to the grindstone," "working tirelessly," "putting in the hard yards," "being diligent," and "grinding away." Each of these phrases conveys the idea of someone focused and dedicated to achieving their goals, so next time you need to describe someone's work ethic, consider using one of these fresh options.