The word "松绑" is formed by combining the character "松", meaning to loosen or relax, with the character "绑", meaning to bind or tie. It is a verb-object compound where "松" acts as the verb indicating the action, and "绑" serves as the object receiving that action, resulting in the literal meaning "to loosen the binding". This construction directly conveys the concept of releasing or untieing something that is fastened.