Juz'iyya: eyes are named but a whole person is meant.
Kulliyya: fingers are named but their tips are meant.
Both involve genuine part–whole relations, yet the direction differs. Merely saying “part and whole are involved” misses the distinction.
Practical check: underline the noun actually spoken. If it names the smaller constituent but means the encompassing whole, the relation is juz'iyya. If it names the whole for a constituent part, it is kulliyya.
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Metonymy, Compound Figurative Expression and Mental Attribution
Juz'iyya: eyes are named but a whole person is meant.
Kulliyya: fingers are named but their tips are meant.
Both involve genuine part–whole relations, yet the direction differs. Merely saying “part and whole are involved” misses the distinction.
Practical check: underline the noun actually spoken. If it names the smaller constituent but means the encompassing whole, the relation is juz'iyya. If it names the whole for a constituent part, it is kulliyya.