have a bee in your bonnet

US /hæv ə bi ɪn jʊər ˈbɑːnɪt/
UK /hæv ə bi ɪn jʊər ˈbɑːnɪt/
"have a bee in your bonnet" picture
1.

avere un chiodo fisso, avere un'ossessione

to keep talking about something again and again because you think it is very important

:
She really has a bee in her bonnet about recycling.
Lei ha davvero un chiodo fisso sul riciclo.
He's always got a bee in his bonnet about punctuality.
Lui ha sempre un chiodo fisso sulla puntualità.