Night fallen.
Meaning: This means that the period of darkness, or nighttime, has arrived. It's like saying, It is now nighttime.
Choice of Words: Night is a noun that refers to the period of time between sunset and sunrise. Fallen is the past participle of the verb 'fall', which means to descend or drop from a higher to a lower position. When you put them together, 'Night fallen' suggests that the period of darkness has arrived.
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