Idiom of the day on “insisting”

until you are blue in the face

› If you say or shout something until you are blue in the face, you are wasting your efforts because you will get no results:

“You can tell her to tidy her room until you are blue in the face, but she won’t do it.”

http://dictionary.cambridge.org/dictionary/british/until-you-are-blue-in-the-face

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