double-cross作动词可以理解为：欺骗（帮凶），蒙骗（同伙），叛卖，出卖。

【例句】
He double-crossed the rest of the gang and disappeared with all the money.
他欺骗了其他同伙，携款潜逃了。

Jack got the cold shoulder from his classmates after he double-crossed his best friend.
自从杰克出卖了他最好的朋友后，同班同学都冷落他。