The word **扳手** is a compound noun formed through semantic combination, where the character **扳** (*bān*), meaning "to pull" or "to turn," is combined with **手** (*shǒu*), meaning "hand." Together, they create a literal meaning of "a hand that turns/pulls," which is a direct and descriptive metaphor for the tool's function. This term exemplifies a common pattern in Chinese word formation where an action (扳) and the agent or tool performing it (手) are combined to name an object—in this case, the wrench or spanner used for tightening or loosening nuts and bolts.