cannibalize
verb [ T ]
( UK also cannibalise) uk/ˈkænɪbəlaɪz/ us MARKETING, COMMERCE
to cause a reduction in the sales of an existing product or service by starting to sell a new product or service:
They hope to sell 5 million of their new game machines, but those sales will cannibalize the sales of their last product.
PRODUCTION
to take parts from a machine or vehicle to make or repair another machine or vehicle:
Trucks have been cannibalized to keep others running.
cannibalization
noun [ U ] ( UK also cannibalisation)
All newspapers today suffer from cannibalization, whereby sales of physical copies are undermined by their own online versions.