Dictionary.com
definitions

sword of Damocles

noun
  1. Damocles(def 2).

Origin of sword of Damocles

First recorded in 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for sword of damocles

Sword of Damocles

noun
  1. a closely impending disaster

Word Origin for Sword of Damocles

see Damocles
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
Idioms and Phrases with sword of damocles

sword of Damocles

Also, Damocles' sword. Impending disaster, as in The likelihood of lay-offs has been a sword of Damocles over the department for months. This expression alludes to the legend of Damocles, a servile courtier to King Dionysius I of Syracuse. The king, weary of Damocles' obsequious flattery, invited him to a banquet and seated him under a sword hung by a single hair, so as to point out to him the precariousness of his position. The idiom was first recorded in 1747. The same story gave rise to the expression hang by a thread.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.