play someone false
play (one) false
old-fashioned To deceive one; to cheat or swindle one. I insisted that they offer something as a collateral before we entered the deal, lest they play us false with their offer. The rogue had been playing the old lady false for nearly a year, preying on her trusting nature to bilk her out of her fortune.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
play someone falseprove treacherous or deceitful towards someone; let someone down.
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