1. (adverb) on a railroad flatcar

• pickaback
• pig-a-back

2. (adverb) on the back or shoulder or astraddle on the hip

• pickaback
• pig-a-back

1. (noun) the act of carrying something piggyback

• carry

2. (verb) ride on someone's shoulders or back

• ride

3. (verb) haul truck trailers loaded with commodities on railroad cars

• haul

4. (verb) haul by railroad car

• haul

5. (verb) support on the back and shoulders

• bear
• carry
• hold

6. (verb) bring into alignment with

• alter
• change
• modify