it's not kosher

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it's not kosher

It isn't fair, sportsmanlike, or legitimate. I know you want to avoid confrontation, but it's not kosher to break up with someone by text message. I don't see why you think it's not kosher. People do it all the time!
See also: kosher, not
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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