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

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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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

cut the ground from under someone's feet

do something which leaves someone without a reason or justification for their actions or opinions. informal
See also: cut, feet, ground
Farlex Partner Idioms Dictionary © Farlex 2017

cut the ground from under somebody/somebody’s ˈfeet

suddenly spoil somebody’s idea or plan by doing something to stop them from continuing with it: When he announced that all my figures were out of date, he really cut the ground from under my feet.
See also: cut, feet, ground, somebody
Farlex Partner Idioms Dictionary © Farlex 2017
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