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“Master key” goes back to 1577, which predates English involvement in the African slave trade.

• OtomotO 5y ago
  in my mothertongue a lot of words were misused during the course of time. they had no bad connotation when they were introduced, but then they were used by "bad people" (by current standards) and now they are "dead" or rather "not to be used" I guess it's the same in English :) But times change