grub2 past tense and past participle grubbed, present participle grubbing [intransitive always + adverb/preposition]
to look for something on the ground or just under the ground, especially by moving things around:
Jake got on the floor and grubbed about under the desk.
chickens grubbing for worms
grub something ↔ up/outphrasal verb
Farmers were encouraged to grub up hedgerows.