Verb
plow under (third-person singular simple present plows under, present participle plowing under, simple past and past participle plowed under) (US spelling)
(agriculture) To destory (crops) by turning them into the ground with a plow
A sharp drop in demand forced the farmer to plow under half his turnips.
Cultivate friendships. If you don't have time to cultivate all of them, plow under every fifth one and collect your bonus. Gracie Allen
Sometimes you got to hurt something to help something. Sometimes you have to plow under one thing in order for something else to grow. Ernest Gaines
You dont plow under the corn because the seed was planted with a neighbors shovel. Ken Kesey