磨破嘴皮子 [ㄇㄛˊ ㄆㄛˋ ㄗㄨㄟˇ ㄆㄧˊ ˙ㄗ; mo2 po4 zui3 pi2 zi5] to wear out one's lips (idiom) to talk until one is blue in the face to repeat again and again ◄ ►