Hit below the belt means act unfairly or cruelly. 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: Hit below the belt can refer to a situation involving act unfairly or cruelly.
• Story example: A writer may use Hit below the belt when describing a situation involving act unfairly or cruelly.
• Exam example: When a sentence contains Hit below the belt, choose the meaning “act unfairly or cruelly.”