Definition of plow under in US English:

plow under

phrasal verb

  • Bury in the soil by plowing.

    • ‘All perennial weeds need to be plowed under completely when the field is prepared.’
    • ‘Instead of being cut and sold, the cover crops are plowed under to nourish the soil.’
    • ‘If they guess wrong, an entire crop could left in the field to be plowed under.’
    • ‘And, of course, by not plowing under the crop residue, the farmers save on costs of labor, fuel, tractors, and other equipment.’
    • ‘Straw can be plowed under, but that costs about $8 to $10 an acre.’