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a sword of Damocles hangs over (one's) head
One is faced with imminent danger or trouble. In Greek mythology, the courtier Damocles was forced to sit beneath a sword suspended by a single hair to emphasize the instability of a king's fortunes. I know his history of violent behavior, so I feel like a sword of Damocles hangs over my head whenever I'm alone with him. With the threat of nuclear war, many feel that a sword of Damocles hangs over the world's head.
a sword of Damocles hangs over somebody's head(literary) also a sword of Damocles hangs over somebody (literary)
if a sword of Damocles hangs over someone, they are in a situation where something bad is likely to happen to them very soon
Usage notes: This phrase comes from a story about Damocles who had to eat his food with a sword hanging over him which was tied up by a single hair.You live with this sword of Damocles hanging over your head, knowing that you carry the virus for a deadly disease.
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.
sword of Damocles
An imminent and/or constant threat. According to Greek legend, Damocles, a friend of King Dionysius of Syracuse, envied the ruler's great wealth and power. When Damocles told the king how fortunate he was, Dionysius offered to change places for a day. As Damocles dined at the head of the table, he happened to look up. There above his head, held by only a single horsehair, hung a sharp sword pointing downward toward his chair. Frozen with fear that the thread would break, he pointed out the predicament to the king. Dionysius nodded, acknowledging that the sword was a constant factor in his life, an actual and a metaphoric reminder that some person or circumstance might at any time cut the thread. Such risk, the king added, comes as an integral part of power. Any ever-present risk, especially one that's hanging by a thread, is how the phrase has been used.