something else again

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.
See also: again, else, something
Farlex Dictionary of Idioms.

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]
See also: again, else, something
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • something else entirely
  • any fool can/could...
  • any fool could (do something)
  • a (damn) sight less/fewer (something)
  • no fox given
  • AIIC
  • (and) not before time!
  • as it were
  • thin dime
  • a (damn) sight more (something)