disloyalty

sell someone down the river

sell someone down the river [idiom]

To betray someone especially because of getting benefit for yourself

sell someone down the river - فروختن کسی
Example: 

I am sure Kate has sold us down the river. Nobody knew about the money except you, me and Kate. I’m sure I haven’t told anyone so it must be Kate.

Longman Dictionary of Contemporary English

sell somebody down the river to do something that harms a group of people who trusted you, in order to gain money or power for yourself

Cambridge Advanced Learner's Dictionary

sell sb down the river

informal

to put someone in a difficult or dangerous situation by not acting as you had promised toact, usually in order to win an advantage for yourself

Collins COBUILD Advanced Learner’s English Dictionary

sell sb down the river

phrase

If someone sells you down the river, they betray you for some personal profit or advantage.

He has been sold down the river by the people who were supposed to protect him.

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

sell (someone) down the river informal : to do something that harms (someone who trusted you) especially in order to get something for yourself : to betray (someone)
• I can't believe my best friend would sell me down the river.

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