Metaphor transfers a term through resemblance. Majaz mursal transfers a term through another relation such as cause–effect, part–whole, former–future state, or place–occupant.
Calling a brave person a “lion” may rely on a shared quality such as courage. Calling spies “eyes” instead invokes a physical part belonging to those people; the intended claim is not that they resemble eyes.
Both require an appropriate contextual indicator, but the operative relationship is different.
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Metonymy, Compound Figurative Expression and Mental Attribution
Metaphor transfers a term through resemblance. Majaz mursal transfers a term through another relation such as cause–effect, part–whole, former–future state, or place–occupant.
Calling a brave person a “lion” may rely on a shared quality such as courage. Calling spies “eyes” instead invokes a physical part belonging to those people; the intended claim is not that they resemble eyes.
Both require an appropriate contextual indicator, but the operative relationship is different.