This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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ad. On the shoulders or back: ride piggyback; a piggyback ride.

ad. By or relating to a method of transportation in which truck trailers are carried on trains, or cars on specially designed trucks.

ad. In connection with something larger or more important: a tariff provision that came piggyback with the tax bill; a piggyback provision to a new piece of legislation.

n. The act of transporting piggyback.

v. To cause to be aligned with an issue, for example, that is larger or more important: "a $21.5-million federal grant to piggyback city and state subsidies” ( New York).

verb-intransitive. To function as if carried on the back of another: "This reagent will piggyback onto an enzyme” ( Seth Rolbein).

adj. On somebody's back or shoulders.

ad. On somebody's back or shoulders.

v. To attach or append something to another (usually larger) object or event.

v. 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.

v. Utilizing last mile wiring (not wireless slang) rented from a larger owner ISP by a smaller ISP, last milers are obligated to sell to competitors in places like Canada.

v. haul truck trailers loaded with commodities on railroad cars

v. haul by railroad car

v. ride on someone's shoulders or back

v. support on the back and shoulders

ad. on the back or shoulder or astraddle on the hip

n. the act of carrying something piggyback

ad. on a railroad flatcar

v. bring into alignment with

"Some terms piggyback off of older technologies, some re-define pre-existing words."

piggybacked    piggybacking    piggybacks   

haul    ride    bear    hold    carry    change    modify    alter   

gondale    telem    portn    20-minute    eighteen-wheeler    test-timer    roller coaster    Logan    horse-and-buggy    double-wide