Definition of cut the ground from under someone's feet in US English:

cut the ground from under someone's feet

phrase

  • Do something that leaves someone without a reason or justification for their actions or opinions.

    • ‘The Olympics, though, cut the ground from under his feet.’
    • ‘Perhaps even more disturbing for him, he half-wittingly joined in the assault, cutting the ground from under his feet.’
    • ‘Eventually the ideology that has won the support of the majority will prevail and cut the ground from under the tyrant's feet.’