Meaning of TIE-IN in English

TIE-IN

■ noun a connection or association.

↘a book, film, or other product produced to take commercial advantage of a related work in another medium.

↘[as modifier ] chiefly N. Amer. denoting sales made conditionally on the purchase of an additional item or items from the same supplier.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.