Meaning of the word "cut the ground from under someone's feet" in English

What does "cut the ground from under someone's feet" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

cut the ground from under someone's feet

US /kʌt ðə ɡraʊnd frəm ˈʌndər ˈsʌmˌwʌnz fiːt/
UK /kʌt ðə ɡraʊnd frəm ˈʌndə ˈsʌmˌwʌnz fiːt/
"cut the ground from under someone's feet" picture

Idiom

to do something that weakens someone's position, especially by making their arguments or plans less effective

Example:
By revealing the truth, she effectively cut the ground from under his feet.
His rival tried to cut the ground from under his feet by spreading rumors.