CM: 1) zab pa'am sbug thag ring po, profound or deep cavity/hollow. Å ri'i khog pa brus pa'i sa sbubs gting phug ring po, "a deep hollow earthen enclosure (sa sbubs) gouged out (brus pa) of the interior of a mountain." 2) rtogs dka' ba'i don, "something (don) that is difficult to realize/fathom." Å dpe' cha'i tshig don gting phug ring po, "the meaning of the words of religious texts is difficult to fathom. [mss]