Past tense of 'disc' (or 'disk'): to break up soil using a disc harrow in farming.
From 'disc' or 'disk' plus the '-ed' past tense suffix. 'Disc harrow' is agricultural machinery; farmers 'disc' their fields to prepare soil for planting.
Farmers speak their own technical vocabulary—'disced fields' in spring meadows tell a story that equipment companies designed this machine verb into agricultural English.
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