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sell someone down the river [idiom]
To betray someone especially because of getting benefit for yourself
![sell someone down the river - فروختن کسی sell someone down the river - فروختن کسی](https://lingoties.com/sites/default/files/images/lexical/sell-someone-down-the-river.jpg)
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.
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