the.com/sword of damocles

A threat so constant you forget it's hanging there until it isn't.

means An impending disaster that could strike at any moment, looming over someone even in the midst of good fortune.

from From an ancient Greek anecdote told by Cicero: Damocles, a courtier, gushed over how enviable it must be to be king. So the king let him sit on the throne for a day — but suspended a sword above his head by a single hair, to teach him that power comes bundled with constant, hanging peril.

origin
Cicero's tale of a flatterer seated under a horsehair-slung blade
the lesson
power looks great until you notice the ceiling
modern use
any looming disaster everyone pretends not to see
the twist
Damocles begged to leave the throne immediately
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