<p><strong>Adverb</strong></p><ul><li>On the back or shoulders: The little girl rode her father piggyback.</li></ul><p><strong>Adjective</strong></p><ul><li>Astride the back or shoulders: a piggyback ride.</li><li>Sharing commercial time, space, etc.: piggyback advertising.</li><li>Carryable or attachable: a piggyback turbine unit.</li><li>Added or tacked on; supplementary: a piggyback clause.</li><li>Noting or pertaining to the carrying of one vehicle or the like by another, as the carrying of loaded truck trailers on flatcars.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>To attach or ally to as or as if a part of the same thing: to piggyback human rights agreements with foreign aid.</li><li>To carry (somebody) on the back or shoulders.</li><li>To carry (truck trailers) by railroad on flatcars.</li><li>Radio and Television Slang: to advertise (two or more products) in the same commercial.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>To be transported aboard or atop another carrier: The space shuttle piggybacked on the airplane.</li><li>To use, appropriate, or exploit the availability, services, or facilities of another: private clinics piggybacking on federal healthcare facilities.</li><li>To carry truck trailers by railroad on flatcars.</li></ul><p><strong>Noun</strong></p><ul><li>A house trailer designed to fit over a pickup truck.</li><li>A truck trailer carried on a flatcar.</li><li>Anything that operates in connection with or as part of another.</li></ul><p><strong>End of Response</strong></p>