Plural of bonnet; soft hats with a brim or peak, worn especially by women and children, or the hinged metal cover of a car's engine.
From Middle English 'bonet', originally referring to a type of hat, possibly from Old French 'bonet', with the engine hood sense developing in 20th-century British English.
Bonnets went from being everyday essential hats to period costume—except in British English, where your car's 'bonnet' (hood) keeps the word alive in the language of mechanics and traffic!
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