WordReference Random House Unabridged Dictionary of American English © 2017
  • efficiency.

  • Collins Concise English Dictionary © HarperCollins Publishers::

    eff /ɛf/ vb
    1. euphemism for fuck: eff off
    2. eff and blindslang to use obscene language

    ˈeffing n , adj , adv

    'eff' also found in these entries:

    Word of the day: joke | drape


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