back of beyond

back of beyond idiom
Extremely remote. For example, John's about to move to some tiny island, truly back of beyond. This term, used as a humorous exaggeration, relies on the meaning of beyond (or the beyond) as “a distant place, beyond human experience.” [Early 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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