Definition of "back-scratcher" []

• An implement for scratching the back, generally made of bone or ivory, in the form of a small hand fixed to a long slender handle. (noun)
• A toy of wood or bone having a thin tongue which presses upon a toothed wheel, on the principle of a watchman's rattle: when it is rubbed on the back of a person, it produces a sound like the tearing of cloth. (noun)

The Century Dictionary (Public Domain)

• "This blog curates all the odd junk lying around parents 'homes, from an impressive back-scratcher collection to the creepiest dog-head hanger you've ever seen (and if you've seen more than one, we pity you)."
• "The old-young man with the portly build was a back-scratcher with an itch of his own."
• "On a writing-table lay a volume of Shakespeare, and, on an occasional table, a carved ivory back-scratcher."