口くちが酸すっぱくなる

expression, godan verb (-ru)

say repeatedly; talk until one is blue in the face

Idiomatic expression used when someone has said the same thing many times, often to the point of frustration. Literally 'one's mouth becomes sour'.

• 口くちが酸すっぱくなるほど注ちゅう意いしたのに、彼かれはまた同おなじミスをした。

  I warned him until I was blue in the face, but he made the same mistake again.

• 母ははは口くちが酸すっぱくなるほど「勉べん強きょうしなさい」と言いった。

  My mother told me to study so many times that her mouth went sour.