a Judas kiss

Judas kiss

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!
See also: Judas, kiss
Farlex Dictionary of Idioms.

a Judas kiss

an 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).
See also: Judas, kiss
Farlex Partner Idioms Dictionary
See also:
  • Judas
  • Judas kiss
  • kiss of death
  • kiss of death, a/the
  • the kiss of death
  • what would Jesus do
  • WWJD
  • Jesus, Mary, and Joseph!
  • come to Jesus
  • Jesus
References in periodicals archive
Geordie Big Brother contestant Michelle Bass faces a public vote for eviction ( after being given a Judas kiss from new housemate Becki.
Kiss of death?
Marco and Nadia were nominated by the rest of the house but Michelle's fate was sealed by a Judas kiss.
NOMINATION SHOCK FOR MARCO'S GANG: BIG BRO HAIREM IS PLUCKED OUT; Tears and tantrums as three face public vote
Elton's kiss on you wasn't so much a Judas kiss, as a vampire one.
EAMONN HOLMES' COLUMN: EMINEM'S KISS AND EL
His name has subsequently become associated with traitor (a Judas) and treacherous kiss (a Judas kiss).
Judas, Iscariot
There are numerous allusions to his crime in figures of speech: a Judas kiss, thirty pieces of silver, and the name itself all signify treachery and deception.
Judas Iscariot