bottomless pit

: having no bottom

: extremely deep

: impossible to comprehend : unfathomable

: a hole, shaft, or cavity in the ground

: mine

: a scooped-out place used for burning something (such as charcoal)

: to place, cast, bury, or store in a pit

: to make pits in

: to set (fighting birds, such as gamecocks) into or as if into a pit to fight

: the stone of a drupaceous fruit

: to remove the pit from (a fruit)