A fixed idea that seems fanciful, odd, or crazy.
Состояние навязчивой идеи, как правило странной или сумасбродной.
Grandmother has some bee in her bonnet about going to the dance.
Robert Fulton had a bee in his bonnet about a steamboat.
She's got a bee in her bonnet about moving to New York!
У неё навязчивая идея о переезде в Нью-Йорк!