习非成是

xífēi-chéngshì

[what becomes customary is accepted as right] 对某些错误的说法或做法习惯了, 反而认为它是正确的。 也作"习非胜是"

习乎习, 以习非之胜是, 况习是之胜非乎?--汉·扬雄《法官·学行》