fixed idea
nounEtymology Calque of French idée fixe.
1
An idée fixe, an obsession, a fixation.
- [I]t was systemic, directed by Washington and signaling a rapprochement between the Americans and Havana, the imminence of which was a fixed idea among Miami Cubans.1987, Joan Didion, Miami, Granta, published 2005, page 77: