口くちを酸すっぱくして言いう

expression, godan verb (-u)

say repeatedly; say until one is blue in the face

Used when someone has said something many times, often with frustration because the listener doesn't listen or change. The phrase literally means 'to say with a sour mouth', implying the mouth becomes sour from repeating the same thing.

• 母ははは口くちを酸すっぱくして「勉べん強きょうしなさい」と言いう。

  My mother tells me to study over and over again.

• 口くちを酸すっぱくして言いったのに、彼かれはまた同おなじ間ま違ちがいをした。

  Even though I told him repeatedly, he made the same mistake again.