«أَمْطَرَتِ السَّمَاءُ نَبَاتًا»
The sky rained vegetation—that is, it sent rain that brings forth plants.
Plants do not normally fall from the sky as raindrops do. Rather, plants are an effect of rainfall. In this expression the word denoting that effect is used for the cause, rain.
This is musabbabiyya. A sound analysis specifies the direction: the named item is an effect while the intended item is the cause.
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Metonymy, Compound Figurative Expression and Mental Attribution
«أَمْطَرَتِ السَّمَاءُ نَبَاتًا»
The sky rained vegetation—that is, it sent rain that brings forth plants.
Plants do not normally fall from the sky as raindrops do. Rather, plants are an effect of rainfall. In this expression the word denoting that effect is used for the cause, rain.
This is musabbabiyya. A sound analysis specifies the direction: the named item is an effect while the intended item is the cause.