The act of wearing or tilting a bonnet; the practice of adorning or adjusting a bonnet on the head.
From 'bonnet' plus the present participle suffix '-ing', with the verb 'to bonner' (to wear or don a bonnet) deriving from the noun 'bonnet' in Middle English.
This word is charmingly archaic—imagine a world where putting on a bonnet was formal enough that you'd describe it as 'bonnering,' showing how rituals of dress used to have their own special vocabulary!
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