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back scratcher

or back-scratch·er, back·scratch·er

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noun
  1. a long-handled device for scratching one's own back.
  2. a person who exchanges favors or services for mutual advantage.

Origin of back scratcher

First recorded in 1785–95
Related formsback scratching, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018