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Of, relating to, or being a pair of similar objects or images arranged such that one is upside down in relation to the other: a tête-bêche pair of postage stamps.
[French : tête, head (from Old French teste, from Late Latin testa, skull; see tester1) + bêche (short for obsolete béchevet, double head of a bed, from Old French : bes-, twice from Latin bis; see bis + chevet, from Late Latin capitium, opening for the head in a tunic, from Latin, head covering, from caput, capit-, head; see triceps).]
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.
(Philately) philately (of an unseparated pair of stamps) printed so that one is inverted in relation to the other
[C19: from French, from tête head + bêche, from obsolete béchevet double-headed (originally of a bed)]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
of or pertaining to a pair of stamps that have been printed with one stamp inverted.
[1870–75; < French, =tête head + bêche, reduced from béchevet placed with the head of one against the foot of the other]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.