D

   anything taboo beginning with the letter D

   Usually damn, damned, damnable, and the like which used to be less socially acceptable in polite speech than they are today:

    And at last he flung out in his violent way, and said, with a D, 'Then do as you like.' (C. Dickens, 1861)

   The big D is death:

    The systematic encroachment of the big D. (le Carré, 1980)