be dirty pool
To be deceptive or unfair. Can you believe they didn't give me all the facts on the property I'm buying? That's just dirty pool. I'm trying to maintain a fair and respectable campaign, but my opponent has no problem blatantly lying about me—it's totally dirty pool! They've secretly been working to oust me from the board? Well, that's dirty pool!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.