talk until (one) is blue in the face
To speak (about something) repeatedly and at length, used especially when one is not being heeded or listened to. You can talk until you are blue in the face, but nothing you say will convince Terry to change his mind. I talked until I was blue in the face, but everything I said just seemed to be going over everyone's heads.
talk until one is blue in the face
Fig. to talk until one is exhausted. I talked until I was blue in the face, but I couldn't change her mind. She had to talk until she was blue in the face in order to convince him.
talk until one is blue in the face
in. to talk until one is exhausted. She talked until she was blue in the face but could not change their minds.