习非成是（習非成是）　

◎ 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》