Meaning of “double-cross” in the English Dictionary

"double-cross" in British English

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double-crossverb [ T ]

uk /ˌdʌb.əlˈkrɒs/ us /ˌdʌb.əlˈkrɑːs/ informal

to deceive someone by working only for your own advantage in the (usually illegal) activities you have planned together:

The diamond thief double-crossed his partners and gave them only worthless fake jewels.
noun [ C ] uk us

They set up a double-cross to cheat him of his money.

(Definition of “double-cross” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"double-cross" in American English

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to cheat or be dishonest to someone who trusted you

(Definition of “double-cross” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"double-cross" in Business English

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double-crossverb [ T ]

uk /ˌdʌblˈkrɒs/ us

to trick or cheat someone who trusts you, for example, a business partner:

After recent events in Congress, both Democrats and Republicans felt they had been double-crossed by their party leaders.
noun [ C ]

He is accused of jeopardising the talks by fuelling fears among unionists of a double-cross.

(Definition of “double-cross” from the Cambridge Business English Dictionary © Cambridge University Press)