0 a ride on someone's back with your arms round the person's neck and your legs round their waist: --
I gave her a piggyback ride.
1 on someone's back, or on the back of something: --
2 to use something that someone else has made or done in order to get an advantage: --
Everyone wants to piggyback on the phenomenal success of the TV series.
3 on someone’s back: --
4 to use something that already exists or has already been done successfully to do something else quickly or effectively: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.