- a ride on someone's back and shoulders肩驮, 背扛。
1
- on the back and shoulders of another person在别人背（或肩）上的：
a piggyback ride.
背驮（或肩扛）前行。
1.1
- attached to or riding on a larger object驮运的, 背负式的; 可在上部附加安装的：
a telescope with fittings for piggyback cameras
带有可安装附带照相机的固定装置的望远镜。
1
- on the back and shoulders of another person肩驮背扛地：
he had to carry him piggyback.
他不得不把他背回来。
1.1
- on top of something else放在…上面：
Duncan headed back with the car riding piggyback on his truck.
邓肯把小车放在卡车上往回赶路。
with obj.
1- carry by or as if by means of a piggyback通过肩驮背扛方式或类似肩驮背扛方式携带。
1.1
- link to or take advantage of (an existing object or system)背负, 肩负; 搭建, 架：
they have piggybacked their own networks on to the system.
他们已经把自己的网络搭建在系统上面。
1.2
- no obj. use existing work or an existing product as a basis or support以现有事物为基础（或支撑）, 依托：
we were piggybacking on their training program.
我们依托于他们的培训计划。
词源
mid 16th cent. (as an adverb)： although analysed by folk etymology in various ways from an early date, the word's origin remains obscure.