Institution: Non Government Teachers Registration and Certification Authority (NTRCA) Exam: ১৮ তম শিক্ষক নিবন্ধন পরীক্ষা (স্কুল পর্যায়) (15-03-2024) || 2024
Topic: Idioms & Phrases, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The phrase "Your clock has run down" is a common idiom used to describe a clock that has stopped functioning due to a lack of power or energy, typically when it has not been wound or the batteries have depleted. In this context, "run down" conveys that the clock is no longer keeping time as intended because it has exhausted its mechanical energy or power source.

In contrast, the other options do not appropriately fit the context or idiomatic expression. "Short" generally refers to distance or a lack of something but does not apply to clocks. "Good" implies that something is functioning correctly, which contradicts the problem presented. "Up," in this context, does not align with the notion of timekeeping but might imply something has concluded or reached a limit, which is not relevant to the functionality of a clock.

Thus, "down" is the accurate choice, making "Your clock has run down" a clear and accepted way to indicate that a clock is no longer operational.