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Douglas Harper's Etymology Dictionary
shacklebolt

"bolt which passes through the eyes of a shackle," 1680s, from shackle (n.), which has been used specifically of the bar of a padlock from mid-14c., + bolt (n.).

Usage examples of "shacklebolt".

Kingsley Shacklebolt and Sturgis Podmore were examining the microwave and Hestia Jones was laughing at a potato peeler she had come across while rummaging in the drawers.