Simple past tense and past participle of grub.(verb)
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Use "grubbed" in a sentence
"Apple tree borers are frequently serious, especially in young orchards, where the trees should be regularly "grubbed" and the borers dug out or killed with a piece of wire."
"When the tobacco growers are ready for preparing their "new ground" they invite in their friends and neighbors, and the field is "grubbed" in a short time."
"I've "grubbed" at a threepenny hash-house, I've been at a counter-lunch,"