Definition of bonnet noun from the Oxford Advanced American Dictionary

 

bonnet

 noun
noun
NAmE//ˈbɑnət//
 
 
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  • a hat tied with strings under the chin, worn by babies and, especially in the past, by women
  • Idioms
    have a bee in your bonnet (about something)(informal)
     
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    to think or talk about something all the time, and to think that it is very important Our teacher has a bee in his bonnet about punctuation.
    See the Oxford Advanced Learner's Dictionary entry: bonnet