idée fixe
noun/ˌiːdeɪ ˈfiːks/
/ˌiːdeɪ ˈfiːks/
(plural idées fixes
(from French)/ˌiːdeɪ ˈfiːks/
/ˌiːdeɪ ˈfiːks/
)- an idea or a desire that is so strong that you cannot think about anything else
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idée fixe