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Definition: Bwlio sy'n ceisio gwneud niwed i gydberthynas y targed ag eraill neu i'w statws cymdeithasol, ee drwy annog ffrindiau rhywun i droi cefn arno, camfanteisio ar anghenion dysgu ychwanegol neu salwch rhywun, targedu statws cymdeithasol neu ariannol ei deulu, ynysu rhywun neu godi cywilydd arno neu achosi helynt yn fwriadol i rywun.
