something else again

something else again idiom
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.

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