The agricultural practice of using a disk harrow to break up and turn over soil.
From disc (variant spelling of disk) + -ing (the present participle), from the agricultural tool called a disk harrow that has rotating disk blades for soil preparation.
Farmers have used disk harrows for over a century—the rotating metal disks slice and flip soil brilliantly—and 'discing' is one of the most common tasks in modern agriculture!
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