something else again
A completely different situation or set of circumstances. Used to emphasize that the reality of something is much more extreme than some other, less problematic condition or situation. Taking a day or two off to deal with the situation is one thing, but being gone from work for nearly a month is something else again. I'm beyond disappointed—I'm completely dumbfounded! I mean, being caught drinking a couple beers or smoking a little pot is pretty on par for a kid your age, but dealing hardcore drugs out of your locker is something else again.
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something else again
A different case entirely, as in If he'd called to cancel, we wouldn't mind, but not showing up, that's something else again . [Mid-1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.