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A traitorous action disguised as a show of affection. The phrase alludes to the Biblical account of the betrayal of Jesus by Judas, who kissed Jesus to identify him to the authorities arresting him. Don't try to be my friend now, it's just a Judas kiss! I know you're trying to get more information out of me so you can report it to the headmaster!
kiss of death
An action or relationship that is ultimately ruinous. For example, Some regard a royal divorce as a kiss of death to the monarchy. This term alludes to the betrayal of Jesus by Judas Iscariot, who kissed him as a way of identifying him to the soldiers who came to arrest him (Matthew 26: 47-49). It dates only from about 1940 but was previously called a Judas kiss.
a Judas kissan act of betrayal, especially one disguised as a gesture of friendship.
Judas Iscariot was the disciple who betrayed Jesus to the authorities in return for thirty pieces of silver: ‘And he that betrayed him gave them a sign, saying, Whomsoever I shall kiss, that same is he: hold him fast’ (Matthew 26:48).
kiss of deathan action or event that causes certain failure for an enterprise.
This expression may refer to the kiss of betrayal given by Judas Iscariot to Jesus in the Garden of Gethsemane (Matthew 26:48–9).
1998 Spectator I commend the Commission's recent Green Paper and its efforts to introduce an enlightened, evolutionary discussion—although I hope my saying so will not be the kiss of death.
kiss of death
n. the direct cause of the end of someone or something. Your attitude was the kiss of death for your employment here.