བསྣུབ་པ to subside/ sink/ be lowered/ fall/ falter; isc. to disappear/ fade from view; to be eclipsed [RB]
ft. of snub pa [RY]
[p snub pa cause to perish, suppress, abolish, abrogate, annul, destroy, annihilate [IW]
[f snub pa] [IW]