[noun] [C] - a person who is not loyal to a friend and helps the friend's enemiesHe started waving his finger and calling me a Judas and said I was no longer his friend.In the Bible, Judas Iscariot was the follower of Jesus Christ who told his enemies how they could catch him.
JUDAS
Meaning of JUDAS in English
Cambridge English vocab. Кембриджский английский словарь. 2012