Piggy-back refers to the act of carrying or riding on someone’s back, typically for a short distance or as a playful gesture. It can also be used figuratively to describe the act of using someone else’s success or resources to further one’s own goals. This term originated from the image of a small child being carried on the back of a parent or older sibling, resembling a piggy being carried to market. In modern usage, piggy-back can also refer to a method of transportation where one person carries another on their back, such as in piggy-back rides or piggy-back races. Additionally, it can be used to describe a type of connection or attachment, where one object is stacked or attached on top of another, similar to how a piggy-back ride is carried out. Overall, piggy-back conveys a sense of playfulness, support, and reliance on another person or thing.