"piggybacks" in the noun sense
1. piggyback
the act of carrying something piggyback
"piggybacks" in the verb sense
1. piggyback
ride on someone's shoulders or back
2. piggyback
haul truck trailers loaded with commodities on railroad cars
3. piggyback
haul by railroad car
4. piggyback
support on the back and shoulders
"He piggybacked her child so she could see the show"
5. piggyback
bring into alignment with
"an amendment to piggyback the current law"
Source: WordNet® (An amazing lexical database of English)
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