piggyback means: Transporting a truck trailer loaded on to a flat car. The trailer mounted on a flat car. (in Cooking Dictionary)

What else does piggyback mean?

Place it on the back or shoulders. (in Merlin Dictionary)

A method of transport in which trucks are transported on rails or on special-designed trucks. (in Merlin Dictionary)

When used in conjunction with something bigger or more significant. (in Merlin Dictionary)

Transporting piggyback is the act of moving it. (in Merlin Dictionary)

For example, to cause an issue to be aligned. (in Merlin Dictionary)

To be able to function on one’s back. (in Merlin Dictionary)