sun 'byin pa
From Rangjung Yeshe Wiki - Dharma Dictionnary
discredit, disprove [thd]
disprove, discredit [RY]
atonement, antidote of assault [JV]
to disown; to be discouraged/ disheartened/ disenchanted; - to undermine/ attack/ disprove [another's philosophical position] [RB]
1) refut[ation]; 2) disparage [IW]
refutation; to disown; to be discouraged/ disheartened/ disenchanted [RY]