Which line in the excerpt from “Out, Out—” by Robert Frost uses metonymy?

The boy's first outcry was a rueful laugh,

As he swung toward them holding up the hand

[Half in appeal, but half as if to keep] [The life from spilling. Then the boy saw all] Since he was old enough to know, big boy

[Doing a man's work, though a child at heart]

He saw all spoiled. 'Don't let him cut my hand off

[The doctor, when he comes. Don't let him, sister!]

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