THESAURUS
burrow
abri, anchor, antre, be incognito, beat the bushes, billet at, bivouac, bore, bunker, camp, cave, cavern, colonize, come to anchor, couch, cove, covert, croodle, cuddle, delve, den, dig, dig out, dike, disappear, domesticate, dredge, drill, drive, drop anchor, drop from sight, dugout, earth, ensconce, establish residence, excavate, excavation, explore, forage, form, foxhole, frisk, furrow, go into hiding, go through, go to ground, go underground, gouge, gouge out, groove, grot, grotto, grub, hide, hide away, hide out, hive, hole, hole up, hunt, inhabit, keep house, lair, lie, lie close, lie doggo, lie hid, lie low, lie snug, live at, locate, lodge, look around, look round, look through, lower, masquerade, mew, mine, moor, move, nest, nestle, nose around, nuzzle, park, people, perch, play peekaboo, poke, poke around, populate, pry, quarry, relocate, remain anonymous, research, reside, retire from sight, roost, root, run, sap, scoop, scoop out, scrabble, scrape, scratch, search, search through, set up housekeeping, set up shop, settle, settle down, sewer, shovel, sink, sit down, sit tight, smell around, snug, spade, squat, stand, stay at, stay in hiding, strike root, subterrane, subway, take cover, take residence at, take root, take up residence, trench, trough, tunnel, warren, wear a mask
ROGET THESAURUS
burrow
Location
VB
place, situate, locate, localize, make a place for, put, lay, set, seat, station, lodge, quarter, post, install, house, stow, establish, fix, pin, root, graft, plant, shelve, pitch, camp, lay down, deposit, reposit, cradle, moor, tether, picket, pack, tuck in, embed, imbed, vest, invest in, billet on, quarter upon, saddle with, load, lade, freight, pocket, put up, bag, inhabit, domesticate, colonize, take root, strike root, anchor, cast anchor, come to an anchor, sit down, settle down, settle, take up one's abode, take up one's quarters, plant oneself, establish oneself, locate oneself, squat, perch, hive, se nicher, bivouac,
burrow, get a footing, encamp, pitch one's tent, put up at, put up one's horses at, keep house, endenizen, naturalize, adopt, put back, replace.
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.