cut the ground from under the feet of somebody

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What is everyone going to start thinking when they see how you've cut the ground from under my feet like this? What are my students going to think for goodness' sake?

In the process, soul has been installed as something that bolsters your life, rather than knocks the ground from under your feet. The extremism I once heard in soul has been evened out.

When delegates from various provincial committees came to St Petersburg for consultations in August 1859, Nikolai Miliutin cut the ground from under their feet by presenting them with an outline of the Commission's views which went far beyond what they had in mind.

(BNC-B)

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