[ ef ]
/ ɛf /

verb (used with or without object), interjection

fuck: Stop effing around and get to work! Eff you, you lout!


the word “fuck”; the f-word: peppering his speech with superfluous and highly offensive effs.

Verb Phrases

eff off, Go away!: Eff off and die, you piece of Martian scum!

Nearby words

  1. eery,
  2. ef-,
  3. efa,
  4. efate,
  5. efavirenz,
  6. eff.,
  7. effable,
  8. efface,
  9. effect,
  10. effecter

Origin of eff

1940–45; euphemism for fuck, with eff as spelled form of the name of the initial letter


efficient, efficiency.
effective, effectiveness.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for eff

British Dictionary definitions for eff


/ (ɛf) /


euphemism for fuck taboo eff off
eff and blind slang to use obscene language
Derived Formseffing, noun, adjective, adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eff


1943, euphemism for fuck, representing the sound of its first letter. Related: Effing.

Online Etymology Dictionary, © 2010 Douglas Harper