To dig in or under the ground; hence, to work hard in any way; especially, to make laborious research; search or study closely.To eat; take a meal: as, it is time to grub.To dig; dig up by the roots: frequently followed by up or out: as, to grub up shrubs or weeds.To supply with food; provide with victuals.n. The larva of an insect; especially, the larva of a beetle: as, the white-grub (the larva of Lachnosterna fusca). Also grubworm.n. A short thick man; a dwarf: in contempt.n. Something to eat; victuals; a provision of food (as the product of grubbing or hard work).n. In cricket, a ball bowled along the ground. Also called, in the slang of cricket, sneaker and daisy-cutter.