Judas Iscariot
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A “Judas kiss” is an act of seeming friendship that conceals some treachery.
Figuratively, a “Judas” is a betrayer, especially one who betrays a friend.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.