piggyback verb 7adjective 3noun 3adverb 1forms 3 verb7 •To carry (someone) on the back or shoulders. •To transport (a lorry/truck) on a flatbed railway wagon. •To attach or append something to another (usually larger) object or event.They tried to piggyback that proposal on the rivers and harbors bill.The popular host can’t claim credit for the trade, though. The idea wasn’t his. He piggybacked off another successful investor who had a history of picking winners. •To ride on someone's back or shoulders. •To enter a secured area at the same time along with (someone having authorized access); to tailgate.Okay, when someone accesses a door with a card key, anyone additional who comes in with them is piggy-backing on their access, like someone riding piggy-back. Get it? •(Internet) To obtain a wireless internet connection by bringing one's own computer within the range of another's wireless connection without that subscriber's permission or knowledge. •(Internet) To utilize "last-mile" wiring rented from a larger owner ISP by a smaller ISP. adjective3 •On somebody's back or shoulders. •Pertaining to transportation of goods where one transportation unit is carried on the back of something else. For example, a truck on a train.A Montreal-Toronto "Piggyback" freight of the Canadian Pacific. — 1959 •Attached or appended to something larger or more important. noun3 •A ride on somebody's back or shoulders. •An act or instance of piggybacking.The growth is taken for granted; what absorbs Americans today is the implication of piggyback for gross revenues and, more important, net profits. — 1960 •The connection of one intravenous drip to another.Piggyback medications are given through a port of an existing intravenous site. […] Calculation of the drip rate for piggybacks is the same as any other drip rate. — 1989 adverb1 •On somebody's back or shoulders. formspiggybacked · piggybacking · piggybacks