judas
/ˈdʒuːdəs/
noun
- A person who betrays a friend or trust; a traitor.
- He was called a judas after he revealed the secret plan to the enemy.
- The spy acted as a judas, selling information to the highest bidder.
- No one trusted her anymore because she had been a judas to her own team.
- A small opening or peephole in a door, often covered by a grille, through which a person can see who is outside without being seen.
- The old castle had a judas in the main gate for the guard to check visitors.
- The prison cell door had a small judas for the warden to observe the inmates.
- She peeked through the judas before opening the door to the stranger.