
Do something till you are blue in the face
Persistence imagery
The phrase evokes the image of someone persisting to the point of exhaustion.

He practiced the piano till he was blue in the face.
Emotional frustration
It implies a sense of frustration or futility in the effort.

She tried to solve the puzzle till she was blue in the face.
Not literal
It's an idiom, so don't take it literally. It's not about actual color change.

They debated the issue till they were blue in the face.
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