Try Our Apps


Avoid these words. Seriously.


[ef] /ɛf/ Slang.
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!
Origin of eff
1940-45; euphemism for fuck, with eff as spelled form of the name of the initial letter


efficient, efficiency.
effective, effectiveness. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for eff
Contemporary Examples
Historical Examples
  • Then he blew into the "eff" holes; and wetting his finger he rubbed the varnish.

    Abe and Mawruss Montague Glass
  • An' eff he don't feel the sperit ter pray, he won't pray, an' I hev got ter surroun' the throne o' grace by myself.

  • She had a little maid who attended her,—eff she called her,—and the girl stood by to watch while Anne did my bidding.

  • So I got the tackle of eff's father—rude enough it was in all conscience—and in the early afternoon I set out to the sport.

  • Then she stopped exhausted, smiled on eff, who sat like a cinder-witch all the while, and smoothed the hair from her brow.

British Dictionary definitions for eff


euphemism for (taboo) fuck eff off
(slang) eff and blind, to use obscene language
Derived Forms
effing, 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
Cite This Source
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
Cite This Source
Slang definitions & phrases for eff



fuck •This curt euphemism is also the base for equivalents of fucked, fucking, and fucker: eff off back to effing Russia/ She effed around until she was forced to work again/ this is the stupidest effing stunt you've ever pulled (1920s+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
Cite This Source

Word of the Day

Nearby words for eff

Word Value for eff

Scrabble Words With Friends