Damocles' sword(redirected from Damocles's sword)
Any imminent, impending, or eventual trouble, danger, or disaster. 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. The threat of war has hung over the region like Damocles' sword for nearly a decade. The new tax law is going to be Damocles' sword hanging over our very business model.
See also: sword