Bite one's tongue means stop oneself from saying something. 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: Bite one's tongue can refer to a situation involving stop oneself from saying something.
• Story example: A writer may use Bite one's tongue when describing a situation involving stop oneself from saying something.
• Exam example: When a sentence contains Bite one's tongue, choose the meaning “stop oneself from saying something.”