Hand in glove means working very closely together, often secretly. 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: Hand in glove can refer to a situation involving working very closely together, often secretly.
• Story example: A writer may use Hand in glove when describing a situation involving working very closely together, often secretly.
• Exam example: When a sentence contains Hand in glove, choose the meaning “working very closely together, often secretly.”