磨嘴皮子 [ㄇㄛˊ ㄗㄨㄟˇ ㄆㄧˊ ˙ㄗ; mo2 zui3 pi2 zi5] to wear out the skin of one's teeth (idiom); pointlessly blather to talk incessant nonsense blah blah ◄ ►