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
gopher
barrow
borough
cut into
turnover
burrowed
burrowes
burrowing
burrows
cavity
cellar
crater
crevice
droppings
footprint
grotto
gully
lair
nest
passageway
warren
waterfall
boro
burro
burrough
pero
thorough