磨破嘴皮

to talk until one is blue in the face

to rub / to grind / to polish / to sharpen / to wear down / to die out / to waste time / to pester / to insist

grindstone / to grind / to turn round

broken / damaged / worn out / lousy / rotten / to break, split or cleave / to get rid of / to destroy / to break with / to defeat / to capture (a city etc) / to expose the truth of

mouth / beak / nozzle / spout (of teapot etc) / CL:張|张[zhang1],個|个[ge4]

surname Pi

leather / skin / fur / CL:張|张[zhang1] / pico- (one trillionth) / naughty

to wear out one's lips (idiom) / to talk until one is blue in the face / to repeat again and again