1.AdverbFrom one household or business to the next.
"He carried the petition door to door, collecting signatures.; He sold magazine subscriptions at inflated prices door to door.; Selling door to door is the best training - and test - for a new salesman."
2.AdverbFrom ultimate origin to ultimate destination.
"The trip takes sixteen hours door to door.; The express company could only handle shipments door to door on the West Coast, needing others to reach the rest of the country.; It was purely a CIA operation, door to door."
3.AdverbFrom shipper to recipient.
"The express company could only handle shipments door to door on the West Coast, needing others to reach the rest of the country."