do something until you are blue in the face

until (one) is blue in the face

For a great or unending length of time; until one has done it to exhaustion. You can complain about it until you're blue in the face, but you're going to school today whether you like it or not. They are such strange friends. They'll argue until they're blue in the face, then they'll go out for dinner and be the best of pals.
See also: blue, face, until

do something until you are blue in the face

persist in trying your hardest at an activity but without success. informal
See also: blue, face, something, until
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