The word "恰恰" is formed through the process of reduplication, where the single character "恰" (meaning "just" or "exactly") is repeated. This repetition does not create a new meaning from separate parts but instead intensifies and reinforces the original character's sense of precise appropriateness, resulting in a strengthened meaning of "exactly" or "precisely". It is a morphological construction where the whole is greater than the sum of its duplicated parts, creating a nuanced, emphatic adverb.