cut the ground from under someone

cut the ground from under(neath) (one's) feet

To suddenly cause problems for one. I plan to cut the ground from underneath the prosecutor's feet with this line of questioning.
See also: cut, feet, ground

cut the ground from under someone

or

cut the ground from under someone's feet

If you cut the ground from under someone or cut the ground from under their feet, you make their ideas or opinions seem less impressive, often by doing something unexpected. The sudden announcement was seen by many as an attempt to cut the ground from under the president's feet.
See also: cut, ground, someone
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