Metonymy is the poetic device used by Seamus Heaney in lines 19-22 of 'Digging.'
Metonymy is the poetic device Seamus Heaney uses in lines 19-22 of "Digging." This technique involves using a word or phrase to represent something else that it's closely associated with. In this case, the milk is used as a representation of the diggers themselves, connecting them through the act of milking.
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