pull the rug from under
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pull the rug (out) from under (someone)
To suddenly or unexpectedly remove or rescind support, help, or assistance from someone; to abruptly leave someone in a problematic or difficult situation. I felt like someone had pulled the rug out from under me when my health insurance said it was going to stop paying for my medical bills. I'd love to quit my job, but I just can't pull the rug from under my team like that.
pull the rug (out) from underInformal
To remove all support and assistance from, usually suddenly.