Hold one's ground means refuse to move back or change one's position. 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: Hold one's ground can refer to a situation involving refuse to move back or change one's position.
• Story example: A writer may use Hold one's ground when describing a situation involving refuse to move back or change one's position.
• Exam example: When a sentence contains Hold one's ground, choose the meaning “refuse to move back or change one's position.”