The word "十足" is formed through a conceptual and metaphorical intensification. It begins with the character "十" (shí), meaning "ten", which in many cultures symbolizes completeness or a full set (like ten fingers or the decimal base). This is then directly compounded with "足" (zú), whose core meaning is "foot" but is extensively used to convey "sufficient", "full", or "ample", as something that fills to the point of satisfaction. By combining them, the concept of the complete, round number "ten" is layered onto the idea of absolute sufficiency, creating a powerful compound that visually and notionally represents being "one hundred percent full" or "complete to the utmost degree".