(until (you) are) blue in the face

for a long time.

The attorneys can talk until they're blue in the face, but I don't think they'll convince the jury that this guy is innocent.

You can argue yourself blue in the face but it isn't going to change my opinion.

Usage notes: used to suggest that someone will not listen to what is being said

• It's feeding time at the zoo!
• it's funeral
• it's high time
• It's just not cricket!
• It's just one of those things.
• It's just one thing after another!
• It's more than my job's worth.
• It's no good crying over spilt milk.
• It's no skin off my nose.
• it's no skin off nose
• it's no skin off your nose
• It's not cricket!
• It's not over until the fat lady sings.
• it's not rocket science
• it's no use
• It's no use crying over spilt milk.
• it's no wonder
• it's now or never
• It's now or never.
• it's one thing after another
• It's one thing after another!
• It's raining cats and dogs!
• it's swings and roundabouts
• it stands to reason
• It's the same old story.