a small round piece of candy, often with a soft center and a chocolate coating.
From French 'bon' (good) repeated twice for emphasis and sweetness. The reduplication 'bon-bon' (good-good) entered English in the 18th century from French luxury culture.
Bonbon is pure French indulgence—the word itself sounds like eating candy, with that double 'bon' rolling off your tongue like the taste of chocolate.
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