cut the ground from under somebody’s feet

idiomPart ofground

cut the ground from under somebody’s feet — idiom

1. To suddenly cause someone's idea or plan to fail by stopping them from continuin

1.idiom
Definition

To suddenly cause someone's idea or plan to fail by stopping them from continuing.

Example

The new evidence cut the ground from under the lawyer's feet.

His resignation cut the ground from under the team's project.