Damocles

[dam-uh-kleez] /ˈdæm əˌkliz/
noun
1.
a flatterer who, having extolled the happiness of Dionysius, tyrant of Syracuse, was seated at a banquet with a sword suspended over his head by a single hair to show him the perilous nature of that happiness.
Idioms
2.
sword of Damocles, any situation threatening imminent harm or disaster.
Related forms
Damoclean
[dam-uh-klee-uh n] /ˌdæm əˈkli ən/ (Show IPA),
adjective
British Dictionary definitions for Damocles

Damocles

/ˈdæməˌkliːz/
noun
1.
(classical myth) a sycophant forced by Dionysius, tyrant of Syracuse, to sit under a sword suspended by a hair to demonstrate that being a king was not the happy state Damocles had said it was See also Sword of Damocles
Derived Forms
Damoclean, adjective
Word Origin and History for Damocles

courtier of Dionysius I, tyrant of Syracuse; his name in Greek means literally "fame of the people," from demos, damos "people" (see demotic) + -kles "fame," a common ending in Greek proper names (e.g. Sophocles, Pericles), from PIE *klew-es, from root *kleu- "to hear" (see listen). To teach Damocles how a tyrant lives, Dionysius seated him at a banquet with a sword suspended above his head by a single hair.