Judas Iscariot

1. The Apostle who betrayed Jesus to the authorities for thirty pieces of silver. When soldiers came to arrest Jesus, Judas identified their victim by kissing him. The next day, driven by guilt, Judas hanged himself.

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.