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]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.