IRRELEVANCE
beside the point and beside the question
irrelevant; of no importance.That's very interesting, but beside the point.That's beside the point. You're evading the issue.Your observation is beside the question.
make no difference (to someone)
not to matter to someone; for someone not to care (about something).It makes no difference to me what you do.Do whatever you want. It really makes no difference.
off the track
irrelevant and immaterial (comments).I'm afraid you're off the track, John. Try again.I'm sorry. I was thinking about dinner, and I got off the track.
dead
mod. (of an issue) no longer germane; no longer of any importance.Forget it! It's a dead issue.The project is dead. Don't waste any more time on it.
dead horse
n. a dead issue, especially one that is referred to continually. (Often with beat, whip.)Forget it! Don't waste time whipping a dead horse.The whole business is a dead horse. Forget it.
dead issue
n. an issue that doesn't matter anymore.It's a dead issue. Forget it.The question of my late arrival is a dead issue.
dead letter
n. an issue that does not matter anymore.This contract is a dead letter. Forget it!The mayor's plan for our raises is a dead letter.
out of the picture
mod. no longer relevant to a situation; departed; dead.Now that Tom is out of the picture, we needn't concern ourselves about his objections.With her husband out of the picture, she can begin living.