The word "帮手" is formed by combining two meaningful characters: "帮" (bāng), which means "to help" or "assist", and "手" (shǒu), which literally means "hand" but is often used figuratively to mean "a person who does a certain job" (like in "能手", an expert). Together, they create a metaphorical concept, a "helping hand", which directly and vividly signifies a person who provides assistance, an aide or helper. The formation is a direct conceptual blend, where the function of helping is personified through the image of a hand.