double-crossing
nounUK /ˌdʌbəlˈkrɒsɪŋ/
US /ˌdʌbəlˈkrɔːsɪŋ/
The act of tricking someone who trusts you.
The villain's double-crossing surprised everyone in the story.
RELATED WORDS
OTHER MEANINGS
2. The act of breaking a promise to help someone in order to help yourself.
His double-crossing cost him all his friends.
3. Cheating in a game or deal by secretly helping the other side.
The card player was caught double-crossing his partner.
4. Being disloyal to a group you belong to.
The spy's double-crossing put the whole team in danger.