The word "竭力" (jiélì) is formed through the combination of two distinct morphemes: "竭" (jié), which means "to exhaust" or "to use up," and "力" (lì), which means "strength" or "effort." Together, they create a compound verb meaning "to exert oneself to the utmost" or "to spare no effort," where the first character "竭" acts as a verb modifier describing the complete consumption of the noun "力," resulting in an idiomatic expression that conveys the idea of pouring all of one's energy into an endeavor. This structure exemplifies a common pattern in Chinese word formation where a verb and its object merge to form a new, often more abstract, verbal concept.