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play (one) false
old-fashioned To deceive someone; to cheat or swindle someone. I insisted that they offer something as a collateral before we entered the deal, lest they be playing 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.
Deceive or betray one, as in If my memory does not play false, I met them years ago in Italy. [Late 1500s]