WordReference Random House Unabridged Dictionary of American English © 2020
how do you do, 
  • (used as a conventional greeting).

  • how-do-you-do  (houdə yə do̅o̅),USA pronunciation n., pl.  -dos. [Informal.]
    1. a greeting; salutation:She smiled and gave him a how-do-you-do fit for a king.
    2. an awkward or unpleasant event or situation:It's a fine how-do-you-do that they've refused to help us out.
    Also,  how-de-do  (houdə yə do̅o̅),USA pronunciation 
    • 1625–35

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