Den

a lair of wild beasts (Ps. 10:9; 104:22; Job 37:8); the hole of
a venomous reptile (Isa. 11:8); a recess for secrecy "in dens
and caves of the earth" (Heb. 11:38); a resort of thieves (Matt.
21:13; Mark 11:17). Daniel was cast into "the den of lions"
(Dan. 6:16, 17). Some recent discoveries among the ruins of
Babylon have brought to light the fact that the practice of
punishing offenders against the law by throwing them into a den
of lions was common.