Breathe down someone's neck means watch or pressure someone very closely. 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: Breathe down someone's neck can refer to a situation involving watch or pressure someone very closely.
• Story example: A writer may use Breathe down someone's neck when describing a situation involving watch or pressure someone very closely.
• Exam example: When a sentence contains Breathe down someone's neck, choose the meaning “watch or pressure someone very closely.”