The word "熊熊" is formed through the morphological process of reduplication, where the single-character noun "熊" (xióng), meaning "bear," is duplicated to create an adjective. This AA-pattern reduplication intensifies the inherent quality associated with the base word. While "熊" denotes the animal, its duplicated form "熊熊" evokes the imagery of a bear's fierce, powerful, and blazing nature, thus metaphorically describing a state that is "ablaze," "flaming," or "raging," as in "熊熊烈火" (a raging fire). This transformation from a concrete noun to a vivid descriptive adjective is a common function of reduplication in Chinese, leveraging sound and repetition to create a new, intensified semantic meaning.