Definition - A figure of speech where words that derive from the same root are repeated to increase emphasis.

Example -
I'm bloody willing to shed blood to see you bleed.

Etymology -
The word derives from the Greek poly, many + ptosis, (grammatical) case.

Oxford English Dictionary -
Its first citation is from 1586:
"Polyptoton or Traductio, when one word is often repeated by variety of cases."
(A. Day Eng. Secretary ii. (1625) 86)

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