THESAURUS
delve
backset, beat the bushes, bore, burrow, cavity, cultivate, culture, cut, dig, dig out, dike, dredge, dress, drill, drive, excavate, explore, fallow, fertilize, forage, force, frisk, furrow, go through, gouge, gouge out, groove, grub, harrow, hoe, hollow, hunt, list, look around, look round, look through, lower, mine, mulch, nose around, plow, pocket, poke, poke around, prune, pry, quarry, rake, research, root, sap, scoop, scoop out, scrabble, scrape, scratch, search, search through, shovel, sink, smell around, spade, thin, thin out, till, till the soil, trench, trough, tunnel, vacancy, vacuity, vacuum, void, weed, weed out, work
ROGET THESAURUS
delve
Concavity
VB
be concave, retire, cave in, render concave, depress, hollow, scoop, scoop out, gouge, gouge out, dig,
delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.
Agriculture
VB
cultivate, till the soil, farm, garden, sow, plant, reap, mow, cut, manure, dress the ground, dig,
delve, dibble, hoe, plough, plow, harrow, rake, weed, lop and top, backset.