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Oriented back-to-back, as of two animals or objects.
[ad- + Latin dorsum, back + -ed, on the model of French adossé, back-to-back, from past participle of adosser, to lean against, place back-to-back, from Old French : a-, to, towards (from Latin ad-) + dos, back (from Latin dorsum).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
placed back to back
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014