down to a fine art
Learned, mastered, or understood perfectly, to the point of requiring little or no focus to do, recall, or accomplish. Make sure you practice these equations until you have them down to a fine art. I always get my routine down to a fine art so there won't be any room for error during the performance. A: "You had all those definitions down to a fine art, though." B: "I know, and I totally blanked when I sat down to take the test!"
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