Present participle of 'chipper'; acting in a lively, cheerful, or energetic manner.
From chipper (adjective/verb) + -ing suffix, creating the present participle form used in progressive tenses and as a noun describing the action.
The '-ing' suffix is one of English's most versatile tools—it can make verbs into nouns, adjectives, or progressive tense forms, which is why 'chippering' instantly makes sense even though we rarely hear it.
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