double-cross (n.)youdaoicibaDictYouDict[double-cross 词源字典]
1834, from double (adj.) + cross (n.) in the sense of "pre-arranged swindle or fix." Originally to win a race after promising to lose it. As a verb from 1903, American English. Related: Double-crossed; double-crossing.[double-cross etymology, double-cross origin, 英语词源]