Keep one's fingers crossed means hope for good luck. 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: Keep one's fingers crossed can refer to a situation involving hope for good luck.
• Story example: A writer may use Keep one's fingers crossed when describing a situation involving hope for good luck.
• Exam example: When a sentence contains Keep one's fingers crossed, choose the meaning “hope for good luck.”