Cut the ground from under one's feet means remove someone's support or advantage. This answer is correct because the expression has a fixed figurative meaning in English. In an SSC idiom question, students should match the whole phrase with its accepted meaning rather than translate each word separately.

• Classroom example: Cut the ground from under one's feet can refer to a situation involving remove someone's support or advantage.
• Story example: A writer may use Cut the ground from under one's feet when describing a situation involving remove someone's support or advantage.
• Exam example: When a sentence contains Cut the ground from under one's feet, choose the meaning “remove someone's support or advantage.”