cut the ground from under

cut the ground from under (someone)

To suddenly cause problems for someone. I plan to cut the ground from under the prosecutor with this line of questioning.
See also: cut, ground
Farlex Dictionary of Idioms.

cut the ground from under

Unexpectedly withdraw support or destroy one's foundation, trip someone up. For example, Overriding his veto, Congress cut the ground from under the President. This metaphoric phrase alludes to removing the solid earth from under someone. [Mid-1800s]
See also: cut, ground
The American Heritage® Dictionary of Idioms by Christine Ammer.

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idea or plan by doing something to stop them from continuing with it: When he announced that all my figures were out of date, he really cut the ground from under my feet.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

cut the ground from under, to

To foil or thwart someone, to trip someone up. The idea of leaving someone no ground to stand upon in an argument was expressed in the late sixteenth century by several writers; occasionally “grass” was substituted for “ground.” James Howell’s French proverb collection of 1659 included Couper l’herbe sous les pieds, “To cut the grass under one’s feet.” Anthony Trollope used the expression in several of his books, including The Warden (1869): “The ground was cut from under her.”
See also: cut, ground
The Dictionary of Clichés by Christine Ammer
See also:
  • cut the ground from under (someone)
  • cut the ground out from under
  • cut the ground out from under (one)
  • cut the ground from under someone
  • cut the ground from under someone's feet
  • cut the ground from under(neath) (one's) feet
  • underneath
  • cut the ground from under somebody/somebody's feet
  • cut eyes at
  • cut eyes at (someone or something)
References in classic literature
Alexey Alexandrovitch had gained a brilliant victory at the sitting of the Commission of the 17th of August, but in the sequel this victory cut the ground from under his feet.
It was impossible to say No: she had fairly cut the ground from under his feet.
In the moment of realization, after all his toil and waiting, you cut the ground from under his feet, destroy his idea, and make his gains worthless to him.
His cordial agreement with all I said cut the ground from under my feet.
He will cut the ground from under his own feet if he does; but I make no exception as regards any one else, for I want to have the matter out and know which is the best man.
According to an EP statement, it also called on the EU to consider convening a donor conference and stressed the need for a political transition in Syria and an inclusive government in Iraq to cut the ground from under the so-called ISIL.