piggyback-v; 3 Senses

Sense Number 1: Ride on someone's shoulders or back; support on the back or shoulders.

Examples:
He piggybacked her child so she could see the show.
As a child, I liked to piggyback.

Mappings:
VerbNet: NP
FrameNet: NP
PropBank: NM
WordNet 3.0 Sense Numbers: 1, 4

Sense Number 2: Haul (commodities) by stacking motor or steam cars or trailers on railroad cars.

Examples:
The trailer piggybacked across the country.
The company piggybacked to save money.

Mappings:
VerbNet: NP
FrameNet: NP
PropBank: NM
WordNet 3.0 Sense Numbers: 2, 3

Sense Number 3: Bring into cooperation with; use as a kind of (metaphorical) scaffolding.

Examples:
They are piggybacking onto developed technology.
The bill piggybacks on previous legislation.
Democrats propose an amendment to piggyback the current law.

Mappings:
VerbNet: NP
FrameNet: NP
PropBank: piggyback.01
WordNet 3.0 Sense Numbers: 5