'og gi btsan bzhi

(Esoteric instructions associated with) the lower door. or secret center of the body, lower approach, the lower door. or secret center of the body [RY]

lower (gate, door, entrances), (training with consort), lower door [JV]

lower gate, anus [IW]

lower gate, anus [Esoteric instructions associated w the lower door/ secret centre] [IW]