When they couch
shachach (shaw-khakh')
to sink or depress (reflexive or causative) -- bend, bow (down), bring (cast) down, couch, humble self, be (bring) low, stoop.
in their dens
m`ownah (meh-o-naw')
den, habitation, (dwelling) place, refuge.
and abide
yashab (yaw-shab')
to sit down (specifically as judge. in ambush, in quiet); by implication, to dwell, to remain; causatively, to settle, to marry
in the covert
cukkah (sook-kaw')
a hut or lair -- booth, cottage, covert, pavilion, tabernacle, tent.
to
lmow (lem-o')
to or for -- at, for, to, upon.
lie in wait
'ereb (eh'-reb)
ambuscade -- den, lie in wait.