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passe-partout

[ pas-pahr-too; French pahs-par-too ]
/ ˌpæs pɑrˈtu; French pɑs parˈtu /
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noun, plural passe-par·touts [pas-pahr-tooz; French pahs-par-too]. /ˌpæs pɑrˈtuz; French pɑs parˈtu/.

something that passes everywhere or provides a universal means of passage.
a master key; skeleton key.
an ornamental mat for a picture.
a method of framing in which a piece of glass is placed over a picture and is affixed to a backing by means of adhesive strips of paper or other material pasted over the edges.
paper prepared for this purpose.

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Origin of passe-partout

1635–45; <French: literally, (it) passes everywhere
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for passe-partout

passe-partout
/ (ˌpæspɑːˈtuː, French pɑspartu) /

noun

a mounting for a picture in which strips of strong gummed paper are used to bind together the glass, picture, and backing
the gummed paper used for this
a mat, often decorated, on which a picture is mounted
something that secures entry everywhere, esp a master key
C17: from French, literally: pass everywhere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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