In a chubby manner; in a way that shows roundness or plumpness.
Formed from 'chubby' plus the adverbial suffix '-ly,' which converts adjectives into adverbs describing how an action happens or how something appears.
Most adverbs end in '-ly,' but this one is funny because 'chubbily' rarely gets used—we'd more likely say 'in a chubby way' or just use the adjective instead, showing that not every grammatically possible word gets popular!
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