care not a groat
To not care at all. A "groat" was an English coin worth four pennies that was taken out of circulation in the 17th century. I care not a groat—do what you wish, Reginald. I care not a groat what the neighbors say—I refuse to take that fence down! A: "He acts as though he cares not a groat about how Mary is spending her time." B: "Well, they were once betrothed, so I'm sure it is just an act."
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