Collins Concise English Dictionary © HarperCollins Publishers::
down and dirty adj (down-and-dirty when prenominal) informal chiefly US
  1. ruthlessly competitive or underhand: if Bush gets down and dirty the Governor will give as good as he gets
  2. uninhibited; frank
WordReference Random House Unabridged Dictionary of American English © 2020
down-and-dirt•y  (dounən dûrtē)USA pronunciation  adj. [Informal.]
  1. Informal Termsunscrupulous;
    nasty: a down-and-dirty election campaign.
  2. Informal Termsearthy;
  • 1985–90

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