do till you are blue in the face

Meaning

1. do sth till you are blue in the face

   to try to do sth as hard and as long as you possibly can but without success

   You can argue till you're blue in the face, but you won't change my mind.

From the same entry

• black and blue
• between the devil and the deep blue sea
• once in a blue moon
• scream blue murder
• out of the blue
• a bolt from the blue
• the boys in blue