Old Sparky en · PROPN
Meanings
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(US, slang) Nickname for an electric chair used for executions.
[…]and I think that, for most of those men, the truth of what was happening to them finally hit all the way home when their ankles were being clamped to the stout oak of “Old Sparky’s” legs.
1996, Stephen King, The Green Mile, page 3: