Definition of idée fixe noun from the Oxford Advanced Learner's Dictionary

 

idée fixe

 noun
noun
BrE BrE//ˌiːdeɪ ˈfiːks//
 
; NAmE NAmE//ˌiːdeɪ ˈfiːks//
 
(pl. idées fixes
BrE BrE//ˌiːdeɪ ˈfiːks//
 
; NAmE NAmE//ˌiːdeɪ ˈfiːks//
 
)
(from French)
 
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an idea or a desire which is so strong that you cannot think about anything else
See the Oxford Advanced American Dictionary entry: idée fixe